Well.... in some ways, "marriage" changed me (in quotations here because we only got officially married this past Jan, we've been together for almost 7 years and have children together). When I reflect on my life previous to meeting my wife, I remember nothing but rushing back and forth from high school/college (when I attended) to shut myself in my house/apartment. I was in a real big hurry to stay the hell away from anyone. This surely stunted any social development I could have attempted to undergo during my teen years, and it was nothing but sheer loneliness, depression, and self-preservation (suicide avoidance) that forced me to reexamine what I was doing and venture out into the world a bit. I took a job at Blockbuster, fell in love with my boss, and we've been together since.
...And then the changes came. I was constantly being forced into situations that caused me severe anxiety. We moved to another state where nothing was familiar and suddenly I was living with this person that I realized I barely knew... and who didn't know me. For many years I disguised who I was completely (I'm good at playing NT, I could play one in a movie). I offset this with long periods of alone time to re-normalize, and eventually this lead to her becoming very distant and cheating multiple times. I didn't know what was wrong with me, which eventually lead me to the AS conclusion. I don't know if marriage (co-habitation) has permanently changed me in any way, but I certainly spend the majority of my life doing things that I would never do on my own. After working out what was "wrong" with me, she became much more supportive of my situation and how I dealt with things, so perhaps this story will have a happy ending.