You relationship sounds very similar to one I had many years ago and let me tell you how blind love is! If he lies now, he will lie in the future. Does he lie to his friends, even about stupid things? You need to act like you don't care(fake it!) and that you are cool with the break up. I agree with the other post to you that you might want to accidentally run into him, but make sure it's not obvious. Then by all means act like you DON'T CARE.
Smile alot . Look happy. That is --if you still want hime back.
You may be sooo much better off without him. I know you can't see that right now because you are in pain, but girl, you sound like you have a life and he needs to get one. The pain will subside if you keep busy. Hang out with girlfriends and don't turn down any dates, even if you don't think you want to go. He may then want you back and you may decide he's not worth it. You WILL heal. It just takes holding your head up high and say to yourself " he's the one who is losing out!" Hope this helps.