I grew up in a household filled with sarcasm, conflict, & hatefulness, & your ex's comments & attitude make me flinch.

You wouldn't ask if you should protect that 4-year-old from poison, you'd just do it.

This is poison-
throw it out of the house.

I wish you the best.

ps: A really effective tool that abusers use is blaming other people for problems the abuser caused.

When your daughter was growing up, did this ex live in the household, criticizing, ridiculing, spewing hatefulness?

Might that, rather than your "ruining" her, have something to do with your daughter's meth problem?

Unless you did him devastating & irreparable damage (like cutting off his fingers), no normal person stays angry for 15 years.

A person who's been angry for 15 years is a person who feeds off anger, who gets his energy from it, who enjoys it.

The day he dies, he'll be angry.
much to his own satisfaction.