dont just dump him
Thats impossible
Have you tried flirting?
make him jealous
Try to win him over.
Okayy....if you want to win a girl back than you win a girl back than just seem sad that you lost her or if you want than flirt with other girls......but dont be all like HARD CORE flirt because than she is going to think your a sluto. If she already has a new boyfriend try to do stuff that her boyfriend doesnt do...like give her ....somethink thats not like relationship stuff like candy or stuff she likes.....if you dont want to than try to score on the goalie meaning to like to beat her boyfriend on the relationship .....if none of this works than just be friends i guess
You don't.
Win the lottery, or have a miraculous experience. Please do not hold your breath .
ignore him and let be seen with a cuter guy.
You don't you broke up for a reason and if you get together with him again you'll just realise it all over again and possibly be tied into an awful or abusive relationship you don't want to be in.
You can't trust her anymore. Give up.
Give him a reason and tell him why you did that..
Cheating is the lowest form of treating someone you are in a relationship with because they trust you and once you have broken that bond of trust it is very difficult to get back. Reflect back on why you and ex left each other and then look at your boyfriend and decide who is the best person to be with. It seems pretty obvious that your ex is playing you like a fine fiddle (having a sexual relationship ... having his cake and eating it too and determined to win you over from your current boyfriend) but don't fall for it! Grow up! At least be honest with your boyfriend and tell him that you are going to break up with him.