It is completely normal to be a little overwhelmed with choices at her age (and your age, too). She might simply like both of you, which is completely normal as well. I was. In her situation at her age and the subsequent guy (like you in the sequence of events) insisted that I break up completely with the earlier guy. I did. I ended up marrying the subsequent guy for a couple of years and having a son with him who will soon turn 20. The earlier guy was mentalli ill in a severe form and after a few years died from suicide despite best efforts on the part of his doctors. That happened in 1998 and I am still sad. The subsequent guy and my ex first H is alive and well but does not care enough to have either the lightest and most superficial email correspondence with me or any sort of meaningful LD relationship with our son who is his only child. I am extremely mad at him not only for that but also for insisting that I stop seeing the earlier MI guy. I also feel shame and sorrow about breaking up with the earlier guy in such a ruthless way (he tried. To take his life but that time was rushed to the hospital and saved). The earlier guy, a brilliant and hypersensitive person, either bipolar or schizophrenic but more likely bipolar, and a super talented composer, did not insist that I choose between the two. He just wanted me to be with him and I wanted to be with the subsequent guy, too, that was fine with him. In hindsight, I consider this the most loving, considerate, selfless, and also age-appropriate attitude, and offer it for you to emulate. Your girl may be overwhelmed by her feelings, choices, and leanings. Especially with your not being on the premises and his being in her classes. Do not rush her choices. Maybe eventually she will prefer to be your exclusive gf, maybe not, but it is in your power to enjoy the time you two spend together. If she is beautiful and funny and everything you ever wish to find in a woman, then, chances are, now or down the line other boys will want to spend time with heras well. She needs to have an opportunity to slowly and quietly learn how to deal with that amount of attention and how to choose whom to accept and whom to reject. You are absolutely correct in your decision to never give her an ultimatum.

Here, more than you ever wanted to learn about the subject matter. and, always practice safe sex.