Chatting with somebody's girlfriend

So I found myself in a bit of an odd situation lately that I am not quite sure the correct way to act. I have a friend who I hang out a lot with. Her sister often tags along with us with her boyfriend. However, her sister and I found out we had a lot of chemistry and have been chatting with each other a lot more than the perspective people we came with. What is one supposed to do when one finds mutual attraction to somebody who already has a boyfriend? What would you do?

Let the best man win. Though it's really up to her to decide if she likes you better than her boyfriend and how to handle it.

There is a lot of X factors in your story Arc. I would say it is not the greatest thing to do to steal away a girl. Many people can have chemistry that does not always mean it has to be romantic. Has she indicated she is attracted or do you just have fun conversations? Do not be the other man if she wants to be with you she needs to end her other relationship responsibly or you can expect it to happen to you possibly one day. Be cautious if she suddenly tries to jump your bones.

I think it entirely depends on the relationship between the 2 of you. For example my best friend is a girl in a relationship with another guy. The 2 of us are really really close, but as friends. Sure he hated it at first, but after we also met a few times he was cool with it. But if you really feel some kind of attraction the things are getting more complicated. You should first of all see for yourself how much you feel attracted to her. If its just because she's good looking thats not really that much. If its about feelings... you're fucked. And so is she. No matter what you'll do or how she decides it will end up pretty bad for all 3 of you. It's up to you, what you do. I wouldnt want to ruin a relationship just for my feelings.

"It’s like when a girl asks you if you want to bang her hot sister. Of course you say no, but neither of you really believes you mean it though."

Just imagine being in her boyfriends shoes. How would you feel? Is it worth ruining someone else's relationship? Sure, it's her choice, but you'd be an influence. Feelings come and go, but I doubt you could say you love her. Thus is coming from a man who just had the exact same thing happen, only I WAS the boyfriend. Nothing like not knowing where she lays on how she feels and knowing that if the guy had any respect for you, he'd back off. But, now I'm free.:) In my case, it was a pain, but it's for the best. I just know that what you may think is a good thing, might actually be a curse for you.

I am pretty confident that the is attracted to me. Neither of us knew we would just "click" on so many different topics. Our personalities just happen to go well with each other. She is a good girl though, and I know she would never cheat on her boyfriend. Personally, I am very attracted to this girl. She is crazy hot. Even so, I'm not going to do any shady business. She's been with this guy for a while. I would want her to make the decision.

Let the man have her lest she finds you the better option. Taking a girl away is kind of dirty, less you feel you love her. But, if it's just some physical attraction kind of "oh, let me see!" thing then I think you shouldn't pursue

If their relationship was bad, that's one thing, but my belief if a girl or guy leaves a perfectly good relationship for someone "better", what's to stop them from doing the same thing to the new person six months from now? My feelings are this. If a girl is in a perfectly healthy relationship and they love each other, it's not worth ruining unless she's unhappy or on the verge of ending it herself anyways. I wouldn't want some guy ruining mine if the rolls were reversed because he couldn't find someone else who is single. This is probably a reason I don't talk to or really close friend many girls already in relationships unless their the gf's of one of my good friends to begin with. Because I don't want to risk the chance of feelings developing or don't want to waste time chasing someone who is already taken.