What are signs of someone being in love with you but they’re trying to hide it?

I think my child’s father want me back but he’s confusing. I hurt him deeply in our relationship, we hurt each other but i hurt him the worse. Now since being broken up he’s confusing me. One min he wants to talk with me all day, the next min he’s giving me the cold shoulder acting angry with me. We are not working to having a relationship again outside our children but why is he acting so bipolar towards me?