Why are you talking to me?
No I don't know what it's like to be in a committed relationship or how much pain it can cause. I guess it's like being an alcoholic or something, but I'm not going to say drinking isn't fun because some people turn into alcoholics.
I'm sorry if I seemed to be minimizing pain of people whose lives were ruined but I said it's not someone to settle down with, it's just a fun ride. If you're into that. Obviously if you want a healthy long term relationship you shouldn't date a sociopath. But they have the benefits of being interesting and never getting clingy and providing amazing emotional intensity so fuck it. It's an experience.
If you know someone's fucked up from the start, you can decide if the experience is worth it. If they actually lied and pretended to be normal, then fuck them, they can rot.