>>279772267 (OP)It's not really realistic. I don't mean cheating doesn't exist but irl it's usually just your girl leaving you and getting with someone else right after, or everyone involved drawing things out with stupid lies and arguments until you get sick of it. The girl usually cheats on the next guy too within months, because it's just her being promiscuous, not really about you or him.
It's all very pathetic and detestable in meatspace, the fetish is more of a humiliation thing.
Realistic NTR is just shoujo manga and stuff like rent a girlfriend, whatever genre that's supposed to be.