I don’t like the guy my twin is seeing.
This is my first time posting on here so sorry if I mess up anything.
I, (27 F) and my twin (27 F) are fraternal but have always been very close. We’ve been living together after moving out from our parents’ place a little under two years ago. She’s looking in the dating pool for a serious relationship but also is open to finding something casual in the meantime. I’m also single but don’t really feel like actively looking for something due to personal preferences as well as wanting to focus on myself, school, and work.
For some added context, neither of us had romantic relationships when we were younger, neither in high school or college. We were both shy and had issues with our weight and were really focused on school then our respective careers. We went to the same college but studied different majors so had different groups of friends, different classes, and now different careers. Our main friend groups, I’d say, are shared or at the very least have hung out with both of us on at least one occasion.
She’s been seeing this guy (24 M) for a little under 3 months now. She has said she doesn’t want a relationship because he isn’t looking for anything serious. But he has been giving her mixed signals. I don’t like the guy. I can’t really pinpoint what it is about him that I don’t like. I get a pit in my stomach whenever she mentions him or mentions she has plans with him. I honestly feel like my mind clouds over and I don’t know how to deal with it. This has never happened with another person she’s dated, and I actually want her to find someone good for her because she deserves all the great things. I know it’s largely a me issue, I have to deal with my feelings and not let others influence my feelings so much, but honestly just looking for advice on if anyone has gone through something similar with their twin and how they’ve dealt with it.
I have let her know I don’t really like him and to be careful, and she said she understood that. Mutual friends have told me maybe I just need to meet him but tbh I don’t want to. It’s been causing a rift between my twin and I and I hate it, maybe that’s added some of the hard feelings I have against him. I really try to just let them work it out and let her handle it but with that I need to find a way to deal with the toll this has taken on my mental state and our relationship.
Like I said, yes I know I have to also deal with my own issues but just want some advice please.
TLDR; I don’t like a guy my twin is seeing casually, and I don’t know how to deal with it. Looking for advice from anyone who has gone through something similar.