Should I just leave him alone?

Don't contact him for a while. This does 2 things, first it will make it easier for you to move on if you don't hear nice things from him. Second, it could create a "fear of loss" if you are no longer around to make him feel wanted, plus you won't irritate him and drive him away. Many people don't like the idea of friendship after a relationship, but I get along very well with most of my ex'es. If he contacts you, try not to talk about your relationship, let him know that you care about him, but never cry or beg him to come back.. That almost never works. good luck.

Don't contact him. give him a chance 2 feel how he'll miss you so badly. but..if he's not..then there's no point 4 you 2 wait 4 him. get over it. I know you can do it. you go gal!!!! I through the same situation also..slowly I can get over him. if he don't need u..then you don't need him. find yourself out.

Oh I know so well how you feel, I had the same thing going on, I never really got how the guy can move on so fast! And this is something that really hurts. BUT I GOT OVER HIM!

I tell you what to do - concentrate on something else, go somewhere and do something, keep yourself busy, that is the only way how to fight with the temptation to contact him.

Remember, try to live one day at a time, don't think about tomorrow (other than that it will be easier each day). Try to win the little battle and do not contact him today. Tomorrow do the same.
I wish you the best luck!

I think it is great idea not to contact him anymore, but I also know it is not as easy to do as say. At the moment it seems very difficult to imagine your life without him in it, but I agree with Pallas, it is time for you to concentrate on yourself.

I don't think he is over you, but if you keep contacting him he will never realise that because he is just so used to having you around.

So try not to contact him and when he does contact you try to be as easy-going as possible, showing him that you have also moved on with your life like he has.

Break-ups are so so hard. He's already started dating someone, and I'm not saying it's hopeless, but you should also put yourself out there and start dating other guys. Also, lean on your loved ones - your friends and family - so that you won't keep thinking about him. The hardest thing about breakups is restructuring your life around yourself when you're so used to being with the other person. It's like you don't know what to do with yourself or you don't think that you'll find someone who understands you in the same way. But you will! Try to contact him a little less at a time. It'll get easier.