I like this girl and I am considering marrying her. She's pretty, understanding, caring and feminine. She's not perfect but I'm happy with her and most importantly, she is completely and madly in love with me... right now :)

I don't usually pay attention to all the guys she talks to. I don't like to pry and I also like my privacy, but she never hides any of these conversations from me. It's just that I am not usually interested. She has a normal amount of male friends and I trust that her interactions are just friendly and nothing more. But like any above average girl, she has had her share of men who were interested in her and who she has rejected in the past.

She is a very friendly and happy girl, which makes all these men fall for her. And there is one particularly hopeless romantic who waited on the sidelines for a couple of years before telling her about his feelings. Like any woman when she is not attracted to a man, she politely rejected his advances. But she definitely liked feeling validated. And I understand this... I mean she is human.

The problem is even after they don't see each other anymore. He keeps in constant contact with her through messaging and phone calls. And she responds back saying she wants to be polite but, I'm assuming, that she enjoys all this attention and banter. When she told me about talking to this guy, I got upset and let her know that she shouldn't be giving this guy hope while she knows fully well that he is still interested in her. She predictably justified her actions by saying that there are no such feelings from her side and the conversations are banal and polite. Being the naive girl she is, she showed me the conversations to convince me that I was being unreasonable. And as I expected, it was typical "Nice guy" giving out endless compliments and telling her "how lucky her future husband is". And she is laughing and responding back in a friendly, excited manner. Puke inducing but not unusual or unexpected.

Anyways, I lost frame and she realized this. She apologized profusely and promised to not continue talking to him. But I have this nagging sense of disgust that I'm not able to shake off. I feel like she kissed me with the same mouth that she kissed him. On one hand, I don't like ordering people around and telling them what to do. On the other hand, I'm not sure if I should just be okay with her mildly flirting with other such men, however honest she is about it. I'm also concerned that being direct with her will only make her hide things from me in the future. For a legitimate reason, I'm fully willing to let her go. But I'd rather not nuke the relationship by misjudging the situation.

My questions:

How do you guys handle this kind of behaviours with your LTRs ?

Should I convey my expectations to her. If so, how ?

What should I consider before making a decision about this ?