People can change if you care enough for a person you see through all of that and realize that people can change over time.
I take a spool of wire. I cut off a piece of wire. I wrap the wire around a mandrel to make a coil. I put the coil in my tank, add some wicking and some juice and vape it. Is it something new, remarkable and never seen before? No, it's just a piece of wire that I CHANGED into a coil.Oh noes!! Do not EVER expect anyone to change.
That's a recipe for unhappiness.
Change is merely the persistence of something - different but still the same.
No matter how much I may try or really want to, I can never change myself into an airplane, or a car, or a rabbit, or a bird. Expecting myself or anyone else to "change" in the context we're using here has about the same chance of success. As @DC2 noted, that's a recipe for disappointment.