Old Man has a creepy Fatherly thing to me.
Betrothed reeks of Obligation and a Stilted Romance.
My Man, sound a bit Country.
Boyfriend, sounds temporary.
I think I just prefer... "Mine" and forget about labels and timelines. People ask too many questions as it is. So what if I want to date for like 2 or 3 years before we throw the M word around.