So I've been divorced from my child's dad for ~4 years now.
Child has AUdhd.
I found my now-partner around the same time as I divorced the dad but didn't tell the child about this.
Child has known about him for about ~2 years now.
Since then, they've met a couple times and my child absolutely despises him. They believe I cheated on their father for him.
It's turning into a hatred of me now because of how much they hate this man.
I don't know what to do. Should I break up with him? I call him/talk to him every day and DC knows this. I fear it might legitimately totally my relationship with DC to stay with him because they clearly despise both me and him.
Help wanted 
Edit: Wanted to add DC is an only child and has a good relationship with their father.