Senior Got Threatened with Sexual Harassment by His Dating Partner, Forced to Return to China

Today I chatted with a senior I've known for quite a while and only then found out he's no longer in the US. He used to work here, and I thought he'd stay, so I asked out of curiosity. Turns out his dating partner reported him to his company, and that kicked off a whole miserable saga. According to the senior's one-sided account, after they started dating, the other person was very pushy about getting married. He felt it wasn't right, but the other person kept pursuing relentlessly. Being the oblivious type, he went on a date with someone else a few weeks later. After that, A and B teamed up to report him for sexual harassment. He said there was a lawsuit, but the company still didn't think it was okay, which led to a transfer and eventually returning to China. I feel like I just ate a huge piece of gossip. I've anonymized and made up some details above, but I'm just really puzzled—is there really no room for recourse in a situation like this? Assuming everything is true, if you run into this, do you really just have to accept it as bad luck? Doesn't that mean anyone could use this trick to destroy someone? The more I chew on this gossip today, the more depressed I get.