Oh, he is just playing grown-up. He does not yet know what is really means to make that kind of commitment. At his age he can barely share his toys much less appreciate sharing all assets and liabilities with another.
At 21, I still didn't know if I really wanted tacos or hotdogs let alone calling the person I was dating at the time "hubby".
Secondly, since when did Fearthefall become the gay moral arbiter of the world? I say props to the man who was hitting on your "hubby" for being open and having the guts to approach him.
When people are interested in someone and don't want to regret not doing something about it, it's called being outgoing.