why do feel so let down when somoene we love decided to do the unthinkable, you cheat and dont feel remorseful about it still stating they had to do i

I read an article years ago in which the author talked about ‘mindful’ dating.

I don’t remember much of the rest of the article, but the writer emphasized the important impact of causing trauma by cheating, violence or other bad behavior. He made the point that the innocent partner’s life would for ever be changed.

I think that’s true.