I feel like im holding a secret.

I have a boyfriend and I love him (would choose him over anyone else and would marry him)

But I also have a friend(??) Who is my master (my bf basically knows this. I haven't out right said he's my master but I talk about the stuff he said or done to me and my bf find it's funny and cute.)

But it feels like I'm holding a secret to him. But idk what that means exactly.