I need to help my depressed boyfriend.

So my boyfriend started rehab and ever since he did he’s been super distant and cold towards me. His responses are short , he’s extremely irritable (very quick to snap on me) and shows little interest in things. I’m really trying to be supportive and give him time because i know it’s hard for him but he doesn’t talk to me anymore and only hangs around me because he feels like he has to but i can tell he just wants to be alone. I feel like I don’t have a boyfriend anymore. I know i sound super selfish and bitchy so does anyone know what I can do to make him feel better or literally ANYTHING to help.