My moods don't make sense

I have been feeling really really depressed lately, I feel down, bored with everything, empty, nothing can make me feel excited. I am sad and I really have zero energy to do anything.
It's been like this for the past 3 weeks, but the thing is it doesn't make any sense.
Finally after a long time, I got rid of any unhealthy relationship and I found someone really special, so special I dare to say he's the man of my dreams. So this should make me happy right? Why am not happy when I found someone who is perfect for me?
I also got accepted to my dream university in a dream city to study a subject I have always wanted.
Everything that has been happening in my life lately is extremelly wonderful and amazing. And I just can't ****ing feel happy about it.
It scares the hell out of me, because I really don't know why is this happening to me. I try really hard to feel happy, but I end up feeling miserable anyway. My mood doesn't make any rational sense and I have no idea why those things don't make me happy because objectively they are all I have ever wanted.
Why do I keep on having absolutely RANDOM moods with noooo I mean really nothing that would visibely cause them.

Wow that's hard. Things are going great for you and you still seem to not be able to be or express happiness? That's kinda weird no offense. Have you told your T if you have one? I wonder why that would be? I hope you can figure it out so you can allow yourself to be happy. Take care

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It is probably due to the feelings that says you do not deserve success. Also it can be quite scary when you succead. You do deserve success.