Yeah, don't put up with that crap. If you honestly love him and don't want to lose him, tell him how you feel and to stop. If he continues to do it, give him the ultimatum that if he doesn't stop, you'll leave him. If you're not so crazy about separating, just leave the dude. Best of luck!

BE DONE WIT HER N HIM TOO IF HE DONT PUT HER IN CHECK.....BUT DEFINATELY CHECK EM BOTH.

Females want what they cant have and for him to turn them down makes them want him more. Thats what you call (thirsties)

you can stil be with him but at the same time you bring it to his attention that you dont like how that girl is flirting with him. and if it continues and he doesnt do anything about it then you leave him.