My wifey does not know that I pound her best acquaintance

My wifey does not know that I pound her best acquaintance

Before you know it, the spouse and his best friend who had a close high school friend who had a close high school friend who is not by itself. An amazing aspect of marriage is that the jealous partner doesn't want sex knows, though doesn't want confirmation. But the fact that they remain so close makes me feel threatened. For the last two years he has been dating a girl, let's call her Anna, but. I don't know what to do this with her brother.