Visitors Story:
I dated a guy who seemed like mister right. After a while his personality drastically changed. He lived next door in a house that was about 50 feet from my apartment so we shared a parking lot and I could tell when he came home.
Well he would tell me he was going to come over and spend time with me but he never would. He said he didn't drink much but he would secretly drink and do drugs when I wasn't around. I found out later because he became careless and did the booze and drugs around me.
I found out he was cheating on me with TWO OTHER WOMEN on a regular basis. If your date's personality changes drastically. Stop and look into things harder.