Ex help

My ex and I have a son. Things have been really bad between us lately. He says he just doesn't want to be with me. But we still occasionally hook up. I know we shouldn't but I'm pregnant and have those needs lol. Better with my child's father then someone else. This morning was weird cuz he actually walked over to me and gave me a kiss before leaving to work. I know I shouldn't read into that. But kissing good bye just seemed weird. What do you ladies think. Normally kissing good bye just isn't something we do since we are not together.