These people's lives aren't ruined. Their lives might be ruined if they bought into society's narrative that they simply must be in a romantic relationship to be a viable human being!
I've chosen to stay single and I'm so much happier than I was when I was constantly trying to make a relationship fit into my life. I don't like being in relationships - some of that is due to bad past experiences, but mostly I think it's just a personal preference - but because society makes such a big deal of romantic love, it takes a lot of confidence to finally stand up for yourself and say, "guess what? That's just not for me!"
Anyway, I wrote about my realization here: https://psiloveyou.xyz/how-i-realized-long-term-romantic-relationships-probably-arent-for-me-fdad5c24c71d