I think you sound like a really kind and loving person and unfortunately it’s people like us who end up being taken advantage of.
I definitely think you should put yourself first. It took me time to realise that with addiction, we can’t solve their problems for them. We are completely powerless in that, it all has to come from them. I have tried standing by and supporting my partner at various points, it did nothing. His use increased and increased until it got to the point he couldn’t hide it anymore and even then, he didn’t try to change until he lost everything (both times that included me, his job, and his home). So I’m probably sounding really pessimistic but that’s just my experience, I wasted a long time being that support for him, when he only really started to change when I walked away.
You sound young with your whole life ahead of you so don’t sacrifice that for him. Put your life and your education first. I do agree you should try to put things on hold if he’s serious about recovery – you can focus on you and if he gets better, great. But just remember you can’t fix him, he has to do it for himself x