I think you are being quite reasonable in assessing things and I would not recommend getting married for some time yet. Keep talking and working things out. Be very cautious about making your commitment legal, because getting out of it can be very messy, should you realize down the road that marriage won't work.
Independent solo polyamorist seeking lover-friends willing to invest in friendship, companionship, and love, but without a need for partnership.
Never confuse commitment with exclusivity, love with ownership, nor sex with intimacy!
For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.
~ Carl Sagan