How to actually move on from an avoidant, and detect one during a talking stage.

I had an avoidant ex who ghosted me, and it left me scarred a lot. Now I'm doubting myself, and I'm too scared to talk to someone else because I don't want to go through the trauma. If you guys have any tips on how to move on it'll be much appreciated. Also, how do I detect an avoidant during a talking stage?