Feeling frustrated with depression and shitty communication

Stacey
So as some of you may know my partner was in an accident which ended with him getting depression. Our relationship was terrible and basically after putting up with 16 months of being treated horribly I finally decided it was time to leave. After sitting down and having that dreaded conversation with him, he apologised for everything and thanked me for everything we had done and said it would probably be best if I did go. we talked a lot and he decided he didn't want me to go and said he would try to work on everything and if things didn't work out we would split up. I gave in to him. Anyway since then he has been apologising for snapping at me for no reason once he worked out it wasn't right. I give him credit for that. There are a few trust issues because of his depression but his communication is just shit! It really frustrates me. Any ideas on what he can do and what I can do to try and work on these? He has refused relationship counselling.