Possibility , boundaries and how do I?

The possibility of being more than friends from a guy’s perspective.
Giving my ex boundaries (which is new for me) and I asked him if there could be more than friends between us in the future. He answered it’s a possibility.
Still call once a week (cause men need to be respected, which is also a new thing to me coming from the other end of the relationship.)
Which I have posted before and gotten really nice advice but now it’s to this. Praying everyday I don’t mess this up.
So after the perspective is answered , how do I maintain it to where the possibility can be a definite?
Possibility , boundaries and how do I?
Post Opinion