She has no feelings for him anymore, but he persists to make advances on her (trying to flirt and kiss her and stuff) and I am getting mad... It is taking every bit of my self control not to go and stomp his guts out, what should I do?
Has she done anything about it? Has she told him to back off and that she is with someone? Has she told him that she does not want his advances? If not, I'd wonder if she enjoys the attention. Definitely talk to her, tell her to make it clear to her ex. If this is something she has done already, many times. Confront him yourself. Not in a physical or violent way. Tell him your girlfriend is taken, clearly, and that you would both appreciate it if he would back off.
Good answer...I like the confront him yaself bit...I would always recommend before violence , take him to one side so no one else can hear and explain to him the situation, makeing sure he knows this is his last warning :) works 10/10 for me in the past...say it right and with enough balls beding it and he will sht it ;)
First you need to talk to your girlfriend and tell her to tell him to back off because, like Bathory said above, maybe she enjoys the attention. If she has already tried, then you need to confront the guy yourself. But I'm pretty sure your girlfriend isn't doing anything to help the situation.
Do what any man should do and go sort him out lad...BUT...ya women needs to do it really,what the ell is she doing allowing it?...thats the biggest question,maybe?