That question ate me alive for 8 months of my life.
I know how that feels. It feels horrible. You should try to be friends with him. JUST FRIENDS. Then, after a while, when you and him are really close, you should be like, say his name is bob. You should be like "Bob, I know we don't really talk about it, but since we are close and all I feel like I can tell you anything" or something along those lines. Then you should be like "Bob, in our relationship, do you think anything went wrong? I mean like, do you still care or what?" Then if he gets really quiet he's thinking. And if he says he cares, take the conversation from there, and tell him how you feel. If he says he don't just as friends. Say something along the lines of "i was just wondering. since your so sure and everything sorry i asked" But that's all there is to it. Its alot easier than it seems, but, you just have to be ready.
Why would it matter if he is your "ex". If he is your ex you should get over him/or/her. You have already dated him/or/her and that doesn't matter anymore. What matters is anything but your ex. Your ex is your past and you shouldn't care whether or he/or/she is dating or seeing anyone. If you want to get back together then don't go down the path where you try to make each other jealous. Talk to your ex and let them how you feel. Or just give them a note about how you feel.
I already answered this follow them or let your friends follow him. Chances are he's probably not.
ANSWER:
Why don't you just ask him, so that way you can really see and sense if he is lying to you. But if he denies it and you still feel something is going on behind your back, then surprise him where he works. That's the only way you will find if he is being unfaithful to you.
There is always mutual friends or gossip around however, you two are exes and what one another does is neither ones business.
when did you break up?
if you are seeing a guy, then chances are he doesnt wanna know anything about your ex
'Ex' means the relationship is over and you should be moving forward into your future so no, don't give your ex your new address. If you feel you need too then you are not over the relationship and you should not be seeing someone else until you know that the first relationship is over.
Ask her.
It just hurts in general when you know someone does not find you attractive or appealing anymore.
if she brags about her new boyfriend, she is probably just making you jealous.
trying to make someone jealous
If you want to know if your ex boyfriend has a new girlfriend then you can either find out from friends you both had or phone him and ask him how he is doing and if he is seeing anyone. Don't make him feel that you are cornering him when you do ask; ask him calmly and if he says he is seeing someone else then let him know you are happy for him even if you are not. This shows maturity.
they still like you and can't help getting jealous seeing you with someone new or you did something that made them mad
If he says he needs time because his ex is giving him grief then that means he is totally NOT over his ex
you will know when he starts acting weird
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.