It's wrong to dictate your significant other's friendships.
Harry and Lisa are dating, and Harry does not like one of Lisa's friends, Tina.
Harry wants to avoid Tina.
Harry is honest with Lisa, and asks that he not be around when she hangs out with Tina.
Harry tells Lisa she has to stop hanging out with Tina.
Lisa is not happy, but obliges and Lisa and Harry keep dating.
Lisa gets angry with Harry and breaks off the relationship.