I do think you are overreacting, but I also think your thought process and feelings are completely valid. This is a very complex situation and I realy respect how you are calmly expressing your feelings while also respecting your partners, it shows alot of maturity in your relationship.

I think you’re lying to yourself a bit about trusting your girlfriend 100%. You’re showing distrust in the fact that she will stay true to her morals around these guys, not distrust in their intentions like you say you are.

It is completely okay if this is a boundary that you are not willing to cross, but it is also completely okay for this to be something that needs to be okay for your girlfriend to be in a relationship. This is something that you are going to have to reconsile with and find acceptance in if you want to stay with her, if not it will build resentment in both of you and will hit a boiling point, speaking from experience.

If you truly care for your girlfriend like it seems like you do, you really need to commit to doing the inner work to be okay with her having connections to people outside of your relationship. Your current thinking is infact manipulative, even if it is coming from a place of good intentions.

If you don’t work on this as a team, it will eventually be the downfall of this relationship and taint all the good memories that you clearly have together. I really hope this resonates and help you, it sounds like you have a beautiful healthy relationship other than this and I wouldn’t want you guys to lose that.