If you cannot show that you can concentrate on studies and still
maintain a r/s, it means that you have to give up the relationship
yourself.
Your guy is not at fault, but he is a distraction and you neglected
your studies. Then you have to forsake him because you're putting
yourself in a bad situation.
If you want to maintain your relationship, you must learn to be
able to study well and do that. It's not hard, but mentally
stressful. At a tender age of yours, you'll likely end up to have
be badly depressed.
However, my opinions and my advice is for you to hear only, not for
you to follow.
You must follow your heart.