So there's this guy and I WAS really into him a few months back. During that time I found out he too was into me! I had the best week of my life with him. Then he told me that he had some issues and that he couldn't have a girlfriend as it was too stressfull and upsetted the balance of his life. I was sad but understood. Then the guy went and asked out another girl ! This really upset me and that's the worst part. Also the other girl doesn't even like him. She's only pretending so That she can make the guy she actually likes jealous. I can't stand it. In the middle I thought I had got over him him but all those feelings came rushing back. I feel like I don't want any other guy except for him. What do I do ?

You're in a situation where you can't do anything. The fact he is with her and not you is out of your control.

Focus on things that are important. Do things you enjoy, keep your mind busy.

How old are you?
Are you still in school?

You have caught a glimpse of his true nature... he should have been straight up with you. Do you really think this guy is good for you?
When someone treats you this way, you see it as a blessing... dust yourself off, concentrate on other important aspects of your life. Certainly there are better guys out there that are worth your time.

See it as a lucky escape,and leave them to their plotting and scheming.

There are decent guys out there,chalk this one up to experience.