He or She has moved on and is just dating to forget about your relationship.
get over it already
when did you break up?
forget him and find someone else
If he is your ex why would you care? ex means ex. Maybe you should concentrate a little more on your life and a little less on his. After all he is your EX.
Don't even try it. You'll put loads of stress on you and him from the ex.
well, maybe make them jealous
I guess you'll eventually have to decide for one of them, and tell the other one - in courteous language, but firmly - that you are already in love with someone else.
If he's your ex-boyfriend, it shouldn't matter whether he's seeing someone else and you probably shouldn't investigate the matter. That what the 'ex' means. Clearly, there's a trust issue here, and if you can't trust him even as an ex-boyfriend, you're likely wasting your time getting into his affairs.
Unfortunatley if he has moved on and is in a relationship with someone else at this time there is nothing you can do nor should do as he is where he wants to be at this time. Let them be, let go and move on.
You dont. There is a reason hes an ex or your the ex. He seems to have moved on so its your turn to move on as well. Besides if he leaves his new gf for you what makes you think he wont leave you for someone else.
ignore your ex
why, he is your ex right