I got back together (briefly, as it turned out) with my ex fiancé after he dumped me. Our ‘break’ was 4 years long. I would have been incredibly sad if he didn’t have any sex life or fulfilling relationships during that time.

A ‘break’ in a relationship is literally a ‘break up’ but where you still care about the other person. Love isn’t always enough to make things work out - life goals (and other things) can make it impossible to make things work forever.

She was honest. She didn’t cheat on you during your relationship. Either you can accept the fact that she slept with someone else during a point when you didn’t have an ‘on’ relationship or not, but I would trust her to tell you if it wasn’t working for her. You guys have decent communication skills or this would have been swept under the rug.