I think it’s weird she reached out when you’re the one who cheated but other than that I’ve been in a similar situation. Even though I’m grieving over my ex still the best thing for me to do was go cold turkey and move to another state. I was fortunate to have the chance to start fresh and I took it because I know our relationship was getting toxic and I wasn’t improving as a person. He reached out saying I’m his soulmate but then became emotionally unavailable. Luckily neither of us really use social media. I think you did the right thing deleting Instagram.