this is such an awful situation! but you're going to have to deal with it, because this guy can't keep affecting your life in this way. him being in all your classes at school is probably really not helping, because getting away from him would be one way to try and get over him.
you're going to have to accept that he's gay, you seem to be ok with it but if there's any part of you thinking you could still get back together, you're going to have to stamp it out, which'll be really hard. you could always try the getting another boyfriend, or even just flirting with other people, just knowing there are other "fish in the sea" may help.
for self harming, that can be hard to crack out of, when i self harmed and knew i just had to stop because one of my closest friends got upset, i gave all my knives to someone else and told them to get rid of them, and - it sounds stupid - but try and stay away from sharp objects, whatever you've been using to harm yourself with, try and make sure you aren't around the object when alone, like keep scissors out of your bedroom. if you tend to listen to a certain kind of music when self harming, try to find some other music to listen to. one of my other friends said rubbing an ice cube over her arm instead of self harming helped a lot.
and just try and realise that you are you, and you don't need anyone else to be yourself and be happy. good luck!
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I lost my teddy, will you sleep with me?
- i'm hers 
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