How to stop fighting with my girl's ex?

ME and MY GIRLFRIENDS EX are BEEFIN IT and IM TIRED OF THAT

well, you can be a man and just let it go. fights and arguments are..not cool, or a turn on. just forgot about him because his immaturity is not worth a break in your relationship with your girl.

Ok from the look of your 'question' This may go over your head but here goes. If this guy is still around because your g/f is still friends with him, tell her that him still being involved with her even on a friends level is causing problem in the 2 of you and that this guy knows that and is using it 2 keep up sh*t.

Now if they aren't even friends then you and your girl need 2 make it known 2 him in person that he needs 2, for lack of a better phrase, f*ck off. Then after just ignore him

Don't put yourself in situations where you two will meet but if there are situations where you both will be there, be a man and ignore whatever c are a p he may have to say to you, you got the girl just feel sorry for the ex.