Ex is dating another
Often you’ll find that the reason it bothers you is because you have taken his actions as some sort of reflection on you and the past you shared together.
It is easy to want to compare yourself to your ‘replacement’ and wonder what he sees in her, but the reality is that you’ll probably never know and you’re burning up energy better used elsewhere.
But look at it this way, you are positive that he will be happier with you than he will be with her. But I know for sure that you love your ex boyfriend otherwise you wouldn’t be reading this right now. Note: If you really messed it up after breakup, then I guess an apology is in order and a letter would be a good idea. Now, you have to use this other girl’s mistakes as your advantage.
It is very important to analyze why you guys broke up and whether or not it’s really a good idea to get your ex boyfriend back.
Whatever the reason he left, you can fix that and get him back.