go beat his ass and make sure she dont know about it and she really liked you then she would tell him to leave her alone and if that didnt work she would let you get rid of him.

Make yourself look really good and him bad. Failing that beat the turd out of him and keep it to yourself!

Frankly if she isn't putting this person in their place herself then perhaps she enjoys the attention and doesn't want it to stop.

Don't bother answering this question. She is now my ex. That bitch has commitment issues really bad.

hm, how old are all of you? None of you sound mature enough for a relationship sorry for being so blunt

Nothing. She's probably encouraging him anyway.

Hey bro. The first thing you have to realize is that in a relationship there has to be mutual respect. Obviously you respect your GF, but the other 2 parties do not respect you. Your GF seems to be ( seems, you have to put an end to this ) a tramp. If she respects you, she will tell that guy to go away for good, and if he keeps coming back, she should get a restraining order from a court, so that the clown ex BF will disipate like bad gas. If she does not do that, she is just playing with you, and perhaps she wants the othwer guy around in case she desides to dump you. Sounds blunt, but some cold hearthed women are like that. Instead of feeling bad, feel proud about yourself, you are young and you have a life ahead of you. There are plenty of good women for you to waste your time on a tramp. If she is truthful to you, then tell here that she needs to tell that guy off once and for all, because this is stressful to you. If the guy appears, beat him up. Most guys that are big do not even know how to fight, they got used to intimidating others by their sheer size, so they really never fought nor fight. If he gets close to you, and you have to ( not advocating you to attack him, but you need to understand that you can put him in his place if need be done, do not coward down, no need to do that ) defend yourself, then hit him with a right fist "straight" into the jaw! The JAW!!! aim at his jaw as if you were a misile. Once hit on the jaw, he will be knoecked down, he will fall like Goliath , on the floor, and finito, no more fight. Remember, SELF Defense, let him come after you, and then smack him. It takes one puch. Now, this all depends on your GF, si she serious in loving you?, if not dump her, no need to fight for a garbage bag. If she loves you and the guy does not go away, you both file a restraining order against him, that will not only keep him away from you, but leave a record for him with the police. Self defense is applied only as such, self defense, and when done, it has to be blunt and powerful. Cheer up bro, you got to find out the situation.

What you need to do is drop his ass. Thats the only way hes going to back off. Just do it without her knowing about it and if you successuflly kick his ass then tell him to back off or theres more coming.

There is nothing you can do. Unless you want to break up with her... She is the only one who can stop this. She needs to stop flirting back and ignore him.