Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: For context me and this woman have decided to become a couple in an exclusive relationship, I honestly feel like she's the love of my life. Both of us have kept our previous love lives rather hush as it honestly doesn't seem to matter.

Both of us decided to have a night on the town and after a date we had planned as she wanted a casual setting in which I could meet her friends and I obliged as I honestly want to know all I can about her.
At one point in the night the conversation turns to someone's name I recognise as someone who my partner regularly speaks to on snapchat, I asked who this person was and he was described "someone who doesn't have the balls to fuck me." It was left at that, I was rather perplexed and thought nothing of it until this guy showed up later that night, to which my partner acted as warmly as she has with anyone that night. She introduced me and he went on his way and he was never spoken of again. I asked her best friend why she still talks to him if all she wanted was sex and she couldn't answer and told me that she'd have my back if it progressed but I feel like if I don't mention it to my partner directly this could become an issue down the line.

Would I be the asshole if I confronted her about this, would it be fair to ask her not to talk to this guy so regularly? 

telling my partner to cut off someone she onky spoke to in hopes of a fling