Hello Raven, I'm sorry that your boyfriend is going through a rough time ~ and that this is, of course, affecting you.
Everyone has bad times, of course, but they are usually made easier by having someone there who cares. Just being there for him may be enough. He may not feel able to talk ~ but just make sure that he knows that you will be there if ever he does
want to share his feelings.
If he is down ~ or you feel down ~ it might bring the conversation round to negative things. As long as he knows that you care and that you don't want arguments, he should, hopefully, understand ~ once he is feeling better.
Anti-depressants can affect people quite a bit.