I don't think he had one immediately pre living armour, but the one the armour put in to kill itself wasn't EMP proof.

Oh, God, I tried to figure that out once. I think that in that the Avengers change rosters every month, especially in the '90s. You can have who you want on the team.

Ru didn't really cheat on him. They weren't in an exclusive relationship when she slept with Stone. I liked her. They were kind of fluffy, and it wouldn't have worked long term, but she was good for him.