Do you think it's okay that I was the other woman/
Why did you get involved with someone who was already in a relationship?
His girlfriend made fun of my clothes and body shape and she seemed like a nag.
I'm sorry that his girlfriend was rude to you, but it's wrong to cheat on your partner, and you shouldn't have helped this guy do that. Messing with someone's relationship just because they were unkind is not a very nice thing to do.
I don't care about ethics. I wish she would've dated someone else that isn't such a heavy smoker though. I'm irritated by his smoking.
You shouldn't be involved in cheating with someone's partner. Even if their partner was rude to you, you should have your own moral standards about what you will and will not do.