I (M20) feel like keeping a past admirer to be unnecessary but my gf(F19) doesnt agree. AITAH?

So me and my gf had a hypothetical discussion about how we would deal with people who confessed their feelings to us before we started dating or after doesn't rly matter as long as the person didnt know we were dating. I personally believe that its disrespectful to the relationship to stay as good friends with someone who clearly attempted to push the boundaries of a friendship and had deep thoughts about my partner. I trust her completely as I believe she can talk to any guy she wants as she is entitled to her own social life so I don't control her in terms of guy friends. shes always super transparent sets clear boundaries and updates me about anything even when weird things happen even when i didnt ask her to, I rly appreciate that part. But being good friends with someone who clearly had further intentions with her just feels off to me like it feels like its against my values. On the other hand, my gf does not see an issue in that and believes that its a matter of trust which to some degree i agree if i trust her fully nothing will happen. But i personally think this is a matter of respect as why bring in an additional admirer to the relationship. She says she doesnt understand how this can be seen as disrespectful and said shooting their shot is not wrong and shouldnt have consequences. I agree about consequences part but how would it be not disrespectful when ur friends with someone who clearly wanted more from u and u have a partner that feels uncomfortable w that. Am i the crazy one here im struggling to understand her perspective i rly am trying to but i cant.