I nearly got a guy to cheat on his girlfriend
What made you think that he wouldn't cheat if you kept going?
Because he's pretty stoic to my offers.
It is good that you were not able to get the person to cheat but you shouldn't have even tried to interfere in the relationship. You would have been known as a homewrecker if he did cheat with you.
Nah, I just wanted to have fun. I'm sure he will cheat soon.
I do not think that you should try to encourage it though. It is not okay to try to meddle in someone else's relationship.