Confused

I’ve been with my boyfriend nearly 3 years now and recently I’ve noticed that since we’ve started college (uk) he’s been really off with me and nit picking at little things that will cause an argument but he went away this weekend with his family and he was completely fine with me and wanting to talk and everything but he came back today and now he’s just started being off with me again for no reason and I’ve messsged him twice within 5 hours and his reply was that he’s on his Xbox and can’t talk rn but it’s confusing because sometimes I feel that I’m wanted and other times I don’t. I got diagnosed with anxiety and depression and he doesn’t make things better I just need some help on how I can help this situation.

UPDATE**

We was arguing once again today and he said to me ‘it’s all in your head there’s nothing even wrong with you’ bearing in mind I have shown him proof from the doctors and everything but I’m apparently faking it for attention 😕