Should I reach out to my nex's ex girlfriend for validation?

I broke up with my nex around 3 months ago and im struggling greatly with all of this. I think i could heal faster if I didn't have to work in the same hospital as him and see him and the people he manipulates to hate me everyday. I've already been called to HR because of him. I feel such anger and pain because of him its hard to deal with.

In the beginning of our relationship i think I was subconsciously seeing the red flags already but wasnt ready to accept it. I reached out to one of his exs and nicely asked about how he was as a person. She told me "good luck ".... now i feel i want to reach back out to her to try to get some kind of validation. I didnt understand the good luck then.... but now I wonder if it was because she knew he was narcissistic. Im torn on what will make things worse for me and what will help me move on and heal. Everything is so new and confusing and painful.