when did you break up?
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.
get over it already
dnt wrry bowt it. you can do much betta xxxxxxxxxxxxx
Ask her.
trying to make someone jealous
they still like you and can't help getting jealous seeing you with someone new or you did something that made them mad
He or She has moved on and is just dating to forget about your relationship.
If your seeing him then why does he need to ask you out ? aren't you already together ?
If he says he needs time because his ex is giving him grief then that means he is totally NOT over his ex
forget him and find someone else
No - you are ex's for a reason and if she has obviously moved on you should as well. Leave the past in the past and direct your interest else where.
Maybe they just want you to be their friend.