Do you find it difficult to let go and ignore a situation in which you know lies are being spread about you?

How hard is it to simply ignore everything when you know a person is feeding people you used to trust a bunch of lies?

I was recently in a situation where a “man” really betrayed a group I was part of. He crossed a line and then had the gall to deny it. I called him on it, with a polite but straightforward note about the situation. He twisted everything, making himself appear a victim and I an aggressor. He also went to several of my “friends” and told such terrible lies that they turned away from me. He continues to spread his BS around, and it’s getting more difficult to bite my tongue.

Has anything similar happened to you, and did you finally confront the liar, or did you reign yourself in and let it go?