Alright guys this is a long one so buckle up.

I've had my FP for a year now. My previous FP and I were in a relationship for five years until I split and found my new FP. I couldn't handle the relationship between my previous FP and I any longer because I felt he didn't care about me any longer (it had been about 2-3 years since I'd started feeling it) so I broke it off. 

I was fine breaking it off, no love lost on my part, but we have a child together so I still have to see him. He does not like my current FP (he thinks I broke up with him because of my current - I didn't). 

When it comes to my new FP, he's more caring than I care to admit. He helped me through a really dark time, saved my life twice and does everything in his power to make sure I'm feeling good and happy. It helps that my medication is correct now. 

He got out of a nine year relationship last year and it's been extremely hard on him, and he's not ready to date anyone. He calls me his but as far as a title to confirm it, that part isn't there. I want to date him and I'm highly insecure about him leaving without a word because we "aren't dating."

Where can I get the reassurance from myself that he's not going to just pick up and leave? What exercises do any of you have that can help me gain a bit more confidence in terms of knowing he's not going anywhere?

Any advice is welcome.