Let her go!!!

Ivan, it's time to let go...

Logic tells you so.
Do as you are told.
Let go!

She is not the one for you. She is not. Trust you logic, not your emotions. Be friends, that's ok. But no more of this ambiguous relationship. It's not good for your health, it's not good for your studies, it's not good for your relationship with your friends. Maybe next time. Maybe not. You've been at this decision for a long time enough, just that you can't bear to let go. As they say, 懂得拿得起，就要懂得放得下。 Just treat her as a friend k? Just a friend... You can laugh with her, can chat with her, just don't fall in love with her... Not now when she has a official boyfriend anyway...