How do you tell someone they have changed without hurting them?

The best way is to probably just flat out tell him. Or you could do it kind of subtly but it might not get your message across. Maybe you could say wow we have been together a long time. And we have both changed, how do you think I have changed, for better or worse. Then let him tell you and then you say this is how you changed. Say some good stuff then some bad stuff then some good stuff etc. Then he might get the hint. Good luck!