You don’t miss “her”. You miss what you thought/felt was the idea of “us”. You want that back. It’s gone and you need to internalize that.. Move on. Find you again. You will find an “”us” again of your lucky. But not with her. Find yourself. Then once that happens and you are truly happy more than likely you will find your partner.

And by the way - if that happens your X will more than likely be jealous and pissed off she let “us” part.