Advice

Tyisha • 20years Old
So I've been with my boyfriend 2years this month our relationship hasn't been the best for about over a year now but anyways I haven't left because he has bipolar and this week he is getting help professionally and refuses to go without me? Is it wrong to stay with someone just to be able to help them or is there something else you guys would do? 
It's just hard to leave someone when they're going through a had time his family have given up on him and I don't know if I could do that to someone I've stuck with. 
Relationship update to help with advice: together nearly 2 years I barely see him, hardly a text or anything but he needs something he will come to me I know it sounds stupid but I've never been one to give up on people who need help our relationship is terrible but I want him to get better and be able to control his bipolar. 
Can someone give me some advice please?  
Thank you,