It’s not that complicated.

April: This is my boyfriend, Derek, and this is Derek’s boyfriend, Ben.
Ben: Hey.
Leslie: Hey…oh…wait, sorry. What’s the situation?
April: What do you mean?
Leslie: How does this work?
April: Derek is gay but he’s straight for me, but he’s gay for Ben, and Ben’s really gay for Derek. And I hate Ben.
Derek: It’s not that complicated.