I have classes now with my romantic interest. Two years ago, I asked her out after she started flirting with me. She rejected me. I have been obsessively in love with her ever since, but I don't know if she realizes this. I barely saw her for 1.5 years. Now we have all classes together again.

Before we had romantic tension, we were both top students who compete to ask the professors the most interesting questions. This grew naturally.

But now, I had practical courses with her. And she was really focused on if I made mistakes. She seemed really intent to find flaws in my work and call me out on it. She sarcastically dished me when I made a mistake, in front of everyone. She called me a b itch jokingly when I didn't wait for her to start an experiment (I never told her I would wait for her). She said I was bad at something as a joke. She firmly said 'I disagree' and 'you are wrong' in our WhatsApp group.

We worked together smoothly though. She asked me if she was being too *****y, and I told her 'I can handle it' and I said 'I think it is fun' (if you are being *****y to me).

I am horrible at mental arithmetic, but she is a natural. I do however have a good memory. When I remembered her mental arithmetic correctly and recalled it, she said 'that's almost scary' about the way I appeared to calculate things. But it was her calculation that she told me the answer to just before. I was almost scared to make a mistake as she is much smarter. Some of our experiments failed, and when I told her I felt I was to blame and felt bad about it, she did console me by saying she believed it wasn't my mistake and the failure was probably beyond our control. So clearly, she also engaged in the push-pull & positive-negative banter.
Furthermore, she asked for my advice several time when we were working individually, when she could have ignored me.

She asked what classes I signed up to. Then she signed up to the same ones. That's kind of natural, as we have the same interests and there aren't many classes. But she did ask. She told me she graduated her BSc. I congratulated her. Then days later, she told me she got cum laude and mentioned her final grade. I congratulated her. She asked if I also got cum laude. I said 'yes'. She didn't congratulate me. I told her I was stressed out about getting it. She was surprised. She told she just tried to have fun and got it 'by accident'.
We both did the same science competition, but at different years. I congratulated her last year. She didn't congratulate me. In fact, she barely asked me about it.

But, after she invited her practical group for dinner and only me and one other guy showed up, somehow things changed. I realized that this dinner with her might be the greatest and most important moment of my life that I would remember dearly for the next 10 years. I offered to help her cook dinner. She replied in WhatsApp with a emoticon percentage of 50% and she accepted my offer to help. It was almost a date as for a long time it was the two of us, and her room mates. In fact, her room mates may have thought I was her date as I wore a fancy dress shirt and she wore her no.1 nicest blouse. She told many interesting things about herself, including insecurities, but only once asked about me (and I gave a basic answer in a boring way when she did).

She now seems afraid of the feedback I gave on her written work. I corrected a spelling error when she was still working on her part of the report, and she told me to stop correcting her unfinished work. In the mean time, she hasn't worked on it for 2 weeks when it was supposed to be done. We had a holiday period in between and she went away on holiday. She very formally messaged me that she would try to work on the report on holiday. I told her very casually that she shouldn't worry about it and enjoy her holiday instead. Then, she told me she had a very busy week (lots of social events and parties, I guess) and that she would do it over the weekend. One more week has passed and the deadline is in a few days. I am supposed to write a conclusion based on her writings and she knows I am waiting for her to finish it. She agreed to a deadline where everything would be finished by now.

Now, we still share classes, but she avoids me. She even hush hushed me from explaining something to her and a fellow student (my explanation was uninvited, I did insert myself in their discussion) because the lecturer wanted to start. She has a way of letting me know she isn't interested in talking to me. Small talk or science talk.

I don't know what her problem is now. Yes, I liked her a lot. And while I never told her, she should know. But she has no reason to assume it is so strong and still there. But why are we rivals now? I showed her respect for her academic ability. A lot of it. I also showed overall trust in her. Why was she so keen to pick up errors in my work? Why is she afraid I find mistakes in her work? Why won't she just tell me she needs more time? Why did she agree to a deadline she failed to meet, then kept quiet? Why doesn't she allow me to ask her how her holiday went? We were almost engaging romantically. I showed I accepted the rejection, or at least I tried very hard. We worked together nicely. We almost had some things going that friends have. We had some push-pull positive-negative banter.

And now, complete change.

We have a few more classes together. I wonder if she is really afraid of me in some way. Or she wants to intimidate me because she feels intimidated by me because I like her too much.

This was probably too long and not on topic, but this seems like a dynamic similar to the one discussed here. I try so hard to not be Asperger's, arrogant, overbearing. I try so hard to be a team player. But doing that and at the same time be a spontaneous person is hard. I thought I was really doing it well. Fact
is, I have to fake it because I don't like most people. I also don't dislike them. It's me having a flat affluent when it comes to other people.

Did she really fake liking working with me? Either to make it easier for herself? Or to make us perform better overall, and make everything go smoother. And now that there is no more reason to do so, I get completely ignored? So she never enjoyed it, even though she was laughing and we had engaging banter?

The group of people I am doing assignments with right now, I basically gave up on trying to score a nice mark to avoid endless discussions because these two people are friends and already cannot agree among themselves and will team up against me because they are friends, regardless of what I say. They basically said to me 'we don't care how correct our answers are as we already know we won't get an A and we won't get a C. We get a B regardless of our answer, so let's keep these wrong and incomplete answers in our report'.

At this point, I am almost at the point where I may consider deliberately saying something stupid, so other's won't feel I am too smart and will dislike me for it. It pains me to correct people, because I can never seem to do it smoothly enough. It is painful to go out of my way to compliment someone on the correct things they said before pointing out the mistake they made.

How I wish that instead I had been grouped with my romantic interest for this assignment. And it should be mutual (but apparently it isn't).