[freakshow]

If a guy dated my daughter for 10 years with no real discernible intention to marry her, I'd tell her to drop him.
I'm old fashion though, I believe that family is primary, not individualistic gain. That a legally binding covenant frees people to be grow closer than assumptions about intention ever could. That you get more joy through the work and sacrifice of marriage than the unending pursuit of changing desires.

It depends on your view of the imoprtance and role of marriage within a society. If he (and many here) feel like it's useless, and that they need to put themselves or their career before you, and you don't agree, then break up.

The worst possible thing you can do is stay with someone because "I've already spent X years with him". That's gonna go from X to 50, so choose carefully. Unless you don't mind getting divorced, but I assume that if you didn't mind, you wouldn't be so adamant about marriage in the first place.