<human>: Can you succinctly summarize the text in 1-3 sentences?

So my gf and I have been together for a year and I recently transferred to her school. Not because of her but for a program. She's in a sorority. I trust her but not her sisters due to the fact that some of them try to convince her to cheat on me during parties when I'm not around. Like "Kiss him he's a nice guy" kind of convincing. So how do I deal with some of her sisters? She's the one that told me all of this so I'm not really worried about her. I just don't like people like that around our relationship.

I was thinking of just putting them on the spot when i meet them and say "Hey you're that girl that tried to make my gf kiss another guy. I don't like that" and just leave it at that.
<bot>: Some of her sorority sisters are convincing her to cheat. She doesn't want to. She's the one that told me. How do I react in a reasonable manner? I don't like people like them around the relationship.