Why is having a boundary of Not wanting your girlfriend to hang out with another guy at their place alone seen as insecurity?

I never had an issues with my partner going on vacation with a group of guys aka friends but always had a big issues with my partner being alone at a guys house. I donโ€™t mind about public hang outs but 100% alone
Why is having a boundary of Not wanting your girlfriend to hang out with another guy at their place alone seen as insecurity?
Post Opinion