Yes, moving can change you but growing up can also change you. Fact is I moved a lot and yes at times it changed me, but only because I was in a different enviroment and one must adapt. I find however I remained true to my sence of values. Other things changed me as well. Getting married and having children, and going from dependent to independent. Its not always about the move. Its called living. We all adapt or we don’t grow as a person. Don’t go backwards unless you are becoming someone loathesome and you was a really great person before. Then you may want to step back and re-evaluate your values and start from scratch. Get new friends that share your values. Some people never grow and don’t know what to do when they see their friends growing and growing away from them. Make sure their evaluation of you isn’t coming from a selfish place on their part.
When I met my husband he would always bend over backwards for his friends. When he married a lot of them pointed out that he has changed. He was still the same great guy but he didn’t care when they took him for granted when they where all he had. But once he had me in his life, he didn’t have to put up with their selfish behavior. They always needed favors but the moment he needed them for something they were never, ever available.
So he didn’t become someone worse, he simply stopped being their doormat.