Minimise contact, stand your ground, don't give him any bargaining chip against you, get people on your side, and watch out for people who might enable his behaviour.
How you do those things is up to you, because they depend a lot of different factors.
Ah, apparently I confused it with slippery nipple. Butterscotch liqueur seems great too, though, plus the Irish cream is still there. (Irish cream is one of my favs, I kind of regret learning how to make it at home because I drink it a bit too much, too often.)