Not sure he's into me anymore....

Hello all! New here....

I've started seeing a guy about 6 months now that wants a relationship and basically someone to move in so he isn't lonely. I'm just getting out of a long relationship with kids. I like him a lot but not ready to jump in to that. I'd like to get to know him more. He was very attentive in the beginning and now he's not so much. He's afraid of getting hurt, which I understand. He's still friendly with his ex of only 4 months. I have no problem with being friends with an ex. She just got out of a marriage and doesn't want a relationship. The problem is he still chit chats with her and visits, but nothing sexual. I think she just likes the attention. I don't want to seem like I'm jealous or bitchy over her bc I'm not! But if she doesn't want a relationship, why keep in contact often. I told him he needs to earn my trust. Yeah I may not want a serious relationship right now but I'd like to build up to it. He told me bc I'm not in a position to give him what he wants right now if she was to want a relationship he would consider it. I really like him and can't get him off my mind. We say good morning and good night every day and keep in contact throughout the day. Another thing is I think he has a temper. He gets pissed easily over petty things. Maybe petty to me but not him...

He talks more about himself than asks me how I am. I enjoy my time with him. But bc he's so busy with work, I feel like I'm making the effort to get together. When I told him that he just says, he has to protect his heart and doesn't want to get hurt. When I ask him if he wants to stop seeing each other, he says no, not at all. Is this worth fighting for? How do I become that incredible woman he won't want to lose?