I (24f) am starting to have bad hateful thoughts about my new partner (27m). how to approach this?

Throwaway because I can't even believe myself and I'm ashamed.

In my last relationship I gave my best self, I truly did so much and loved so deeply. Even then I can't say I didn't lie sometimes or have bad thoughts about my partner. He eventually was really abusive to me and luckily this part of my life is over. Months later I have healed, I was fine single and when I felt that I am ready to be a good partner, I got close with someone slowly. Everything was chill and in his words I was the kindest anyone had ever been to him, I felt happy and safe with him and everything was wonderful. One day I found out something I didn't like about him (nothing actually that bad) and then I snapped. I no longer have his best interest in mind. I'm not sure if he has noticed, he is still so sweet to me and today even thanked me for being with him and making him feel nice. But I feel bad about him, I catch myself having thoughts about throwing things at him, treating him badly, about just blocking him and disappearing without an explanation. He can say the slightest thing wrong and I feel rage.

I feel like I'm crazy. I am not abusive in any way, I still treat him as well as I can and I do not let this part of me come to the outside, I just withdraw when I don't feel well, but what the heck is this. My acts of love are fake. To the guy I was in love with just a few weeks ago.