Let it out. Cry. Beat the crap out of a pillow. I was betrayed by my girlfriend and best friend at the same time, so I know how you feel. Playing a game, watching a movie, or trying to take your mind off it is not going to do a damn thing. It might work for a while but it's all going to come back to you at night, while you lay on your bed with nothing else to do or think about. You need to sit down, by yourself, and think about this. About how you were betrayed and whatnot. You need to realize and come to the decision in your mind that you were not the cause of this situation and that even though you met some people that were full of shit, not everyone is like that.
Once you've done that, you can start getting back on your feet. Take this time to try out some new hobbies, meet some new people, or other things you like to do. Every time you start to feel sad or angry about what happened, remind yourself of the decision you made earlier. That you were not to blame and people are just shitty. Keep countering your bad thoughts about what happened with something positive. For example, if a thought pops up in your mind about how much you liked the girl, think about what she did and if you knew she was like that, you wouldn't want anything to do with her. Slowly but surely, you will start to feel better and then pretty soon you won't give a fuck at all about what happened.
That's how I roll. Hope I was of some help.
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Cant go on