<human>: Provide a brief overview of the text.

She has had casual sex several times with a few of our mutual friends in the past year, and it really bothers me. Each one of them claims to have broken things off with her as well. When we hooked up initially, my friends and I made jokes at her expense, but this was before I thought anything serious or consistent might follow.

We have been hooking up pretty consistently (but not exclusively) for the last few months. Its probably common knowledge to  anyone involved that this has been going on. Despite my feelings I can't get past the fact that she had sex with several of my friends or that we've essentially slut-shamed her. It also bothers me that she had feelings for me in the past which I ignored, and now wish I hadn't.

Are any of these legitimate reasons to not want to take our relationship to any serious level? I may have to break things off entirely soon, since our ambiguous FWB relationship is getting in the way of other potential hookups/girlfriends, and I feel I've been putting off this decision off too long.
<bot>: I have feelings for my FWB, but her "slutty" relationship with my friends ruins my thoughts of a serious relationship