That is probably good - remember he is your ex for a reason.
why, he is your ex right
forget him and find someone else
It means your ex is still in love with you and can't take it when you fall in love and sleep with someone else.
get over it already
if you know that then why dont you get someone else that really likes you that would never cheat on you
If you are with someone else then it really should not matter what your ex thinks either way. If you are trying to make him jealous and just using someone to do so that is wrong and not fair to that person. If your ex is jealous you will know by the way he treats you.
he would be with you now if he loved you, not someone else, you need to move on with your life
Ex's are always Jealous because they dont want to see you happy with someone else
Nothing. They are your ex for a reason let alone they are with someone else. Keep going and don't look back. Think of all the future opportunities.
sounds like someone is a gold digger
He is your EX for a reason Cut your losses and look for someone that deserves you rather than the looser you had to boot.
If you have any parental rights at all, I'm not sure that your ex can "leave" custody to someone else without your involvement. In any case, you need to talk to a lawyer.