i’m in need of help

I was in a toxic relationship with a guy “o” for a year and a half even though we only dated for like a week officially. He constantly cheated but would never admit to it when I would ask and make me feel like I was the one who was in the wrong. We finally ended things around 9 months ago and I’ve tried talking to 2 other guys but I feel like i’m unable to catch feelings anymore since my last relationship and i’m not sure if it’s bc i’m not over my ex completely or what so what is your guys advice on how to finally get over my ex and move on? my friends have told me to just move onto another guy to get over my ex but i’m not sure :/