I can't help but wonder if my pussy was just so tight that some of the guys I fucked were "ruined" for life. Maybe I just clenched so hard it destroyed his chances of ever feeling pleasure outside of my hole ever again! (That's sarcasm, if it wasn't painfully obvious)
I get it, everyone wants to feel like they're the best at sex. Everyone wants to feel physically desired and for men that almost always means the main focus is the dick. But really, "ruining" someone? Just, ew.
I wouldn't want him to feel like he "ruined" me for other people. I want him to feel happy for me that I can feel pleasure from a variety of penis shapes and sizes. Same way I want him to be happy that he's had the chance to be with so many different women (there's more I want to say about that but it's off topic so I'll leave it at that).
The idea of "ruining" a partner signifies possessiveness. I'm not on that boat, not floating down that river, not using those paddles to get where I'm going.