I feel so stupid.. so stupid

My last relationship was about two years ago, I was deeply, DEEPLY in love with this guy. Head over heels for him, all I wanted to do was be the best partner for him. 10 months into our relationship he started to become abusive.. physically, mentally & emotionally. He’s choked me, dragged me on the floor and lied about anything & everything.. I finally left after two years being with him, I thought I moved on.. I didn’t want to if I’m being honest but I knew I had too.. it’s been two years since and I’m in a new relationship, 8 months with this new partner and he’d never put his hands on me.. I know he wouldn’t.. the thing is, my abusive ex just texted me (he hasn’t reached out before) and I never responded but I can’t help but feel so so so sad & off. I hate him for ruining us, ruining me but why do I feel this way??? I feel so stupid for even feeling this way.. I can’t help but get mad and hate him because I’ve never loved anyone the way I loved him..

I don’t know if this is fair to my new partner to be feeling this way..

why do I feel like this? Why am I getting sad?

What do you think..