So In January my fiancée offered his friend to come live with us to visit for a few days. He came down on Dec.23th and was only supposed to stay until the 27th , but then decided to stay longer January 2nd. Mind you his friend is single , been living on his own since 16 (parents died in a car crash) etc. so on December 26th my fiancée asked him to be best man, that night we had dinner and his new "best man" asked "so bachelor party, strippers , hookers , prostitutes eh?!" My fiancée said no we don't any female company Alexa doesn't like it. His friend said " why its his last night of freedom, why don't you trust him, I think it is an unhealthy relationship that you cant trust matt to go out for one night" I told him response " his last night of "freedom" was when we started dating four years ago, I have had this boundary since we started dating , I do trust him but I view it as cheating and if I was to have another guy grind up on me and naked matt feels the same way it is a form of cheating , I told him no strip club while dating why would it change for bachelor party? it should be just guys hanging out and relaxing and I feel strongly about no female company at bachelor party and vice versa" His friend still argued with me but he finally accepted it. Matt also does not any of that either says only woman he wants to look at is me. Than we went out for dinner another night and he asked matt to check out our waitress and to rate her from 1-10 and he started talking about matts ex girlfriends. His friend also said multiple times that he thinks we are an unhealthy couple and he also had the nerve to tell me I shouldn't call my fiancée matthew that his name is matt. So long story short matt has talked to his friend a few times since then and I haven't seen him since. I do not like him at all but he is still in the wedding party but not best man. I am worried his friend will not listen to our boundaries for bachelor party and I honestly do not want to talk to his friend at all during wedding. The more I plan the wedding the more anxious about how it will go plus I do not know who to pair him up with because I told my bridesmaid this story and they all do not like him at all.