Do they believe their alternate version of events when they DARVO?

Does my ex really think I’m the one that did the things she did to me?

If she does, how could I ever know that I’m not the one who did it? How do I know that my version isn’t a story I made up to make myself feel better? My friends say that that isn’t possible. They say they saw her being mean to me, being problematic, etc. But what if that’s just because I’ve tricked them?

I realize this probably sounds ridiculous, but I can’t get this out of my head. It’s causing me a ton of anxiety.