Me? I find it creepy that he has not disclosed to her the sexual nature of your interactions. He's waiting until she declares her intentions, and THEN he's gonna tell her he is sexual with you? Sounds like bait and switch to me. Little out of integrity. That would bother me more than worrying about whether or not he's going to stay or leave.
Love is that condition in which the happiness of another person is essential to your own...
Robert A. Heinlein
Me: female, bi, (formerly hinge of a vee)
with FirstBoyFriend (FBF)(moderately long-distance)
and no longer with CurrentBoyFriend (CBF)(who lives in the apartment building next door)