Hi TS,
I think the fact he goes up to you as a fb is not so bad.
Everyone has needs and wants, and I would not be in position to comment on that.
But it is right to say if he has kids, maybe going beyond fb is a lil dangerous and unfair to the poor innocent (the kids).
U may yearn for love, but from your sharings, it seemed like he wants sex only, and u wan love (by giving him sex perhaps u hope in return?).
The to and fro rs does not seemed equated, and hence perhaps your delimma?
Perhaps u have not a real bf b4?
Maybe find a bf bah... u might find that its a whole new experience.
Go with the mindset of being a frd den good frd den decide if u wan this new fb or bf.... or perhaps bff....
Hope my 1-cent worth helps. ^^
All the best!
PS: I am always up to chat if u wan.