I don't know what to do?

I know I'm late on this one but I know that feeling, especially if it's someone you've been SUPER crazy for and have been dating for a long time. I've been there before myself several time but as sad as it is to say, the only thing you can do is to try and move on as best as you can. Enjoy the time you have while you're single. I would advice against jumping straight into another relationship while you're still getting over him but if someone comes along and you're both crazy for each other then that would be great but don't hold out hope for it because that rarely happens. Just love yourself and enjoy what life has to offer while moving on, try not to think about him and spend time with the people who are there for you now. Just be patient, everything will work out eventually!

I'll give you the same advice I keep telling myself: If they moved on and have forgotten about you then you never mattered enough to them to make them stay and care for/about you. In other words, you deserve someone who will give you the same love, respect, time, devotion, effort, etc that you show them. Those who don't understand this simple give-and-take aren't worth your time. This goes for pretty much anyone. Don't faun and weep over someone who is willing to throw you away.