2 cents

I don't think he is a reasonable guy, nor a typical American guy.

A reasonable guy should not expect you to pay rent when the space you get in his place is pretty much just half side of his bed.

A typical American guy may want you to share dating/living cost, but will not ask for an expensive birthday gift, then, in return, give you a card for your birthday. This behavior is beyond decency in any culture.

A calculating guy like him may never want to get married if you move in with him under the agreement you described. Why would him? He gets best deal he can possiblly gets, all benefit of marriage with no responsiblity plus financial gains (someone pays his mortage with him yet has no claim of the house).

That said, I know you are not ready to walk away from this relationship. If you want to be with him all the time, better to living with him while keeping your own place and see where it leads to. That way, at least you do not invest too much in this relationship financially in case things go sour. Good luck.