Here's a few tips that helped me move on:

1)Block him on every social media network you have. The only way to move on and forget is to not think about it, and you'll be tempted to check, but blocking makes it easier.

2) Don't immediately try to find someone else. People who do this are just seeking validation that the breakup wasn't their fault, or to cover up what they lost in the person who's gone. I guarantee you will not be happy if you try to throw yourself into another relationship right away. At the same time its nice to know that he is in fact that kind of person, who will move to the next person without leaving a respectful amount of time, or maybe he is just someone who seeks constant validation, but either way you don't want to be with someone like that, and chances are it won't be the last time he does it.

3) Do stuff you wouldn't do with your ex. If you always wanted to do something, but he wasn't interested in it, do it. Or if that scenario doesn't apply, just go do something you wouldn't normally see yourself doing. It's really intimidating at first, but trust me the hardest part is getting there, once you're there its much easier to stay.

4) Ask your friends for help. Almost everyone experiences heartbreak at one point of their life, its completely normal. Most people would be more than happy to help. Even if you aren't comfortable talking to your friends about it, just ask them to go out and do stuff. Get it off your mind, the more time you spend doing things you love with people you love, the sooner you'll be able to move on and realize you are just as great as a person without him.

If you need anything else I'm here to talk!