system
A chat on subreddit /r/NoStupidQuestions
human
True partners won't cheat even if all their friends are of opposite sex. If one of them two starts cheating, it means that they were not made for each other and love can't be forced.
gpt
No one knows who their true partners are, or perhaps they only find out right before they die. It takes a lifetime of evidence to prove that someone was in fact true.