moving on

this sounds super bad but in most cases, and in personal experience it's very true, but basically if he moved on that quickly it usually means that he lost feelings or fell out of love with you before the break up, so don't compare his moving on process to yours. In terms of moving on, I suggest you let yourself feel whatever you need to feel for as long as you think is right. Try writing out your thoughts and feelings but remember not to lose your sense of self in the process of moving on. I know when I had a hard time moving on from an ex I basically abandoned all of my hobbies and he was pretty much the only thing I could talk to people about. It's getting better now, and the strategies I used to help myself were mostly just letting myself feel every emotion that came up when i thought of him. Talking to your friends about your feelings is good, however I've noticed that the more you mention him to other people, memories flood back and it is harder to heal. 

Trust me, you're going to be okay ️

I'm sry to hear about that I can't really give any advice cuz I'm in the same boat. 

I somewhat agree with user Selkie here, that he probably moved on long before you guys brokeup. This is just a guess, but it's likely that he was talking to this new chick while you two were together, and unless there were any major differences between you two (pro/anti-marriage, children, religion, etc), left solely to pursue her. I know this because I've cheated, and been cheated on myself (you reap what you sow). 

Were there any reasons for the breakup? In any case, DONT MESSAGE HIM. He's in love (delusion) with someone else right now, so anything you send is guaranteed to be ignored. Wait until his new relationship inevitably falls apart to say anything, and even then, don't be too quick to take him back.