Tired of this Depression

i'm a 19 year old student living on my own, i have a mild autistic disorder which has caused some trouble throughout my life, but I learned to cope with that(more or less). I experienced a depression about a year ago. This was because I moved out of my parent home and I had some trouble adapting to this lifestyle in combination with my autism. My major problem is that before this depression ended is faced another one. This one was cause by a girl which I liked who started a relationship with a close friend of mine. At fist I thought I would get over it in a few months, but it has already been almost a year now. My friends(including that girl) first wanted to help me, but over time things seemed to get worse so they gave up on it. I started to drink heavily and use self-injury to clam myself whenever I get very down by this(2-4 times a week). So I decided to contact the school psychologist, but this has proved to be futile. recently this girl has said that she doesn't want to return to the kind of relationship we once had(just good friends) because of this situation. And now whenever I see her with the other guy (I can't avoid them because we`re in the same social group) I get very angry and can`t seem to enjoy myself anymore eversince this is going on. It may be my autism which causes me to be unable to let go, but still it continues to hurt. So please give me some advice, because I'm sick an tired of this depression

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