I think that you should think long and hard about this boy. What if he cheats on you again if you start dating? You shouldn't really let someone who's hurt you as bad as it seems he has get back with you because then he'll think you're a bit of a "doormat". I don't mean to sound preachy it's just that you're a fellow Mibbian and we should all stick together.
And if you're friend is really that depressed then I think she may need a counsellor because from what it seems she is too far gone for just friends to help.
I know what it feels like to be in your shoes. You're torn. My advice is to think long and hard about this boy. If you think you can trust him and if you believe he won't cheat on you again then I'd say think about getting back with him.
I think you should maybe talk to your friend about her problems a bit more and find out the root of said problems. If this does not help and she is intent on causing herself damage then the only thing you can do is talk to her about professional help. It'll be hard for you to talk to her about certain things and mention the counsellor but in the long run it will help her.
And if you're friend is really that depressed then I think she may need a counsellor because from what it seems she is too far gone for just friends to help.
I know what it feels like to be in your shoes. You're torn. My advice is to think long and hard about this boy. If you think you can trust him and if you believe he won't cheat on you again then I'd say think about getting back with him.
I think you should maybe talk to your friend about her problems a bit more and find out the root of said problems. If this does not help and she is intent on causing herself damage then the only thing you can do is talk to her about professional help. It'll be hard for you to talk to her about certain things and mention the counsellor but in the long run it will help her.