Why do you think that being the one to say "let's separate" will hurt less?

Why do you think that her being with another man will hurt you less if you are separated?

EITHER WAY, the pain will be the same if you aren't detached. THAT is where you need to focus. Separated or not, you can't control what she does. So your focus needs to be on YOU and your kids.

Not on her and your R.