I feel stuck in my relationship

I normally don’t post things like this on the internet but I really don’t have very many friends to talk to about it and i need to get it off my chest.

I’ve been dating my boyfriend for close to three years now and it’s been amazing, recently he’s been a little colder, has stopped caring about things like school and his life outside of his sport, that being running. Recently he’s had some personal family issues come up and refuses to talk about them yet takes it out on those around him. His grades have fallen and he’s failing atleast half of his classes this semester alone. But doesn’t seem to care at all.

I’ve been really worried about him and tried to talk to him about it but he just gets annoyed and shuts down before I can get close. So now I find myself worrying about not only my finals coming up but his now too. I’ve had a chest pain from the stress of him for the last week and reoccurring headaches that have left me exhausted and unfocused. I just wish he would talk to someone about what ever is bothering him and admit that he isn’t doing okay.