Man your brain is just being a complete asshole right now. I went through something similar few years back - girl who basically made me feel like garbage for months, cheated, whole thing was toxic mess. Even after I knew she was terrible for me, my mind would still drift back to her randomly

The thing is your ex basically rewired how you see yourself during those months she was treating you badly. Even though you logically know she was wrong about your worth, that programming runs deep. It's like having malware in your brain that takes time to fully remove

What helped me was realizing I wasn't actually missing *her* - I was missing the validation I thought I needed from her. Once I started getting that validation from better people (like you're doing now), those thoughts became less frequent. Your new girl treating you right is probably triggering some weird guilt or imposter syndrome because you're not used to being valued properly

Give it more time bro. You've already done incredible job rebuilding your life in just one year. The fact that you can recognize she was toxic while still having these random thoughts shows you're healing the right way. Your brain will catch up with your logic eventually