My Uncle taught me this saying "Watch how people treat other people and pretty soon they will get around to treating you this way."
That works for people that treat others well, and for people that treat others poorly.
I like to flip it around whenever someone asks the question you are asking:
"Watch how people treat you and pretty soon they will get around to treating others that way, too."
It's Not About You. I promise. And if for some reason he has had some miraculous change in character, which is unlikely, it still doesn't make his poor treatment of you about you.