No, it's not a lie.

At least, I don't think it is.
But as far-sighted as you are, you can probably see that this thing can only be a preview of what's to come.
I would hate to move away from you, but I know I'll have to, and I don't want to be scared of the future now, but I am.
Pessimism aside, I could only wait until I am in my thirties to really look you in the eyes and give you a ring as beautiful as you.