Why not tell it how it is? If he is near you again, let him know, "do not come near me, I think you are just a pathetic creep and you make me want to spew. Keep away or you will lose your shrivelled up nuts."
I was groped by a friend's husband, and that was my little speech to him, accompanied by looks of disgust and flashing eyes. He fled the scene, and kept well away from me.
God bless