Roommate likes my boyfriend?

Ok so this is really weird but we live with a roommate. He’s my boyfriends best friend and I kinda get a vibe that they are gay. Because the roommate always pees in the backyard and my bf looks at his dick and always ask him why is his dick hard

Like it’s hard to explain everything

It almost feels like the roommate feels he is in competition with me since I am his girlfriend

Like I set up a romantic dinner just for me and my boyfriend

It was a steak dinner with nice sides and I had candles lit up, it looked super romantic

And then the roommate comes along and wouldn’t leave us alone even though it’s obvious that I set up a date

There’s so much more but it’s hard to explain

Basically my question is..... what should I do?