what to do about the Jerk....???

[Mr.WeakTight]

we have a home game. there's one guy that is a fairly good player, comes most of the time, and genererally is well behaved. however, he has a little Hellmuth in him.

eg the last time we had a game, he busted out when he moved in with XX and got called by Qxs b/c the caller had chips to spare and he figured the jerk's calling range was wide.

another time when I wasn't there he apparently was being unsportsmanlike as well. at that time, he was sent a written message indicating that he needed to clean it up and he had been better since then.

so now what should we do? also, to complicate the situation, his sig other also plays and there are no problems from the s.o. so it would be complicated to ban.
also, one of our regular players has seen him pull this stuff at a bar leage and at the local B & M.

warn one more time and threaten ban?
and if we have to ban, how do we go about banning one and not the other? what do we do if they both show up? let em both play that one time and then take both of them off the list?