some guy(s) keeps calling my gf.. what should i do!?

I think you've got a good idea of what's going on. Great deductive reasoning. Don't take it too far though. Maybe she likes having guy friends, including her exs, but for some reason feels the need to lie about it so not to upset you? I'm not saying that she is definitely not cheating. I'm just saying "Who knows?". I do agree with you that she doesn't seem to be telling you the whole story with why they keep calling her.

Yeah It seems really funny that theses people are still calling her, unless she is being stalked which is probably not likely, she's probably talking to them, i've called girls before and they don't answer i quit calling them well before two months,

you know what dude I'd give the show cheaters on t.v. that show late night a call, you can look them up online, they'll find out for you 100% if she's lyin to ya. I think they also give you a reward, I have zero tolerance for girls that play these kind of games, If she is then find one that won't

yes its definately bs. cause i'll tell ya right now she's talking to them when ur not around. if it were only like a month or something it wouldnt be that big of a deal - but if its been like 3 months then yeah i dont think i would be trusting her.

I think that the responsibility to tell him to stop calling first falls onher if she will not cut her loose cause she is gonna cheat on you... now if she does and the dude still doesn't quit, then dude it is time to open a can...

She should have her number changed if she doesn't want him calling and if he calls even when the number gets changed then she would have to give it to him, right?

I wouldn't trust her if her phone is constantly ringing off the hook. something is up.

id say ya she is so if shes yours then she needs to tell them off or trust her.

Did that done that. Sorry to say, she still talking to other guys.

she probably talks 2 them when u arent around.

Ask her to change her number.