How do you co-parent when there’s feelings still involved?

I’m really stuck in the middle on how to co-parent but control my feelings at the same time. He’s rushed into something with someone new and got mad today when the new girl was dropping him off because I was still sitting at the grandmother’s house when I was dropping off our daughter. He said “how am I supposed to lose feelings for someone when you’re letting her sit at the house, she needs to leave”. But he was nice and talking to me Saturday and was asking if I was staying or not. it’s like a whole 360. I haven’t tried to cause any issues or confrontation but it’s kind of hard to move on when I still have to communicate and see him and I know how much I still Iove him and want the best for him. I just know now my main focus is my daughter and doing right by her now.
How do you co-parent when there’s feelings still involved?
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