Most Helpful Girl
That's the typical cowards way of getting out of an unwanted relationship "it's not you, it's me". Since you've already opened up to him, it's best you leave with your dignity and learn from this. There were obviously red flags and you wanted to see past those.
Don't be surprised if soon down the line he reaches out to you, but be strong and you'll be able to think much clearly. People like him are extreme disappointments