A lot of LBS's think that since they didn't share feelings before BD that they should start doing it after BD, that it's a worthy 180. But a two way sharing of feelings is what should happen in a healthy relationship, and you're not in one right now. So your job is to listen and validate. You don't reciprocate by sharing your feelings with her, because when you do that she thinks "oh he's just trying to make this all about himself as usual."
As far as trying to see things from her point of view, that's not necessarily what validating means. In Retrouvaille we learned you shouldn't say things like "I know exactly how you feel." Because you really don't and she actually might resent you for saying that. All you're doing is acknowledging that her feelings are hers and they are legitimate whether you understand them or not. This is why so many LBS's struggle with validating, because they don't AGREE with what their WAS is feeling. But validation isn't putting a stamp of approval on what she's feeling, it's merely accepting that her feelings are real to her.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712
