I feel alone and empty what should I do with helping my best friend?

Ever since the guy I like has been sad and stressed. It makes me sad I’m doing everything for him cause I care so much and now he said his going off social app we talked on for while since he’s stressed over his job and lack of sleep due to first shift. I just miss him and worry hopefully he moves in July 2018 here. I miss him so much but I don’t wanna text him or bother him he said he would be back. But he needs help his under weight and his roommate comitted suicide he wasn’t close to him and he told me he used him and all but idk I think that’s a lot to handle regardless. He has trust issues like past gf used him friends did. So I’m doing my best supporting m being there. I can’t let him ever kill himself killing urself doesn’t solve any problems.. because of this all I feel empty inside and scared and sad. I’m trying to cope be positive I work part time I’m happy at work I just need to fix my mind