It sounds like you have already answered you own question.
You're boyfriends...it is what it is.
Embrace and enjoy and live in the moment.
If you say the word aloud neither of you will be "POOF" a pillar of salt"!
I don't understand why some guy as so afraid to attaching an identity to the relationship.
It makes it real.
That you are responsible and accountable to the emotional, physical and spiritual well-being of another person as he is for you.
Isn't that the reason why you're in it?
I say run with it...enjoy it and my best to you and your boyfriend.
revel in the new found happiness and exuberance that you have been blessed with.