I met with the ex yesterday, cause I needed clarity. He said some things and I'm hoping someone can give me an understanding. Details below

He mentioned I was too fragile, and hurt easily which is why he couldn't tell me the truth. He also said, " I don't know what I did to end up with someone like you,""you're so good," etc. What does this mean....? We also discussed hypothetical questions like if he would leave her (apparently she knew about me), and but his response was, "do you want me to leave her?" I kept telling him it was his decision. Regardless, we left with me being resolute on my decision to part ways with him but he did let me know all that led up to the break up. When I reached home he sent me a text saying he reached in. I don't understand them as she left him when they were together due to monetary issues, dated many people and now has a child. She just came in and interrupted on something that we were trying to rebuild..., and yesterday he mentioned she threatened to cheat on him if he ever takes on another person. I don't get this..... I always thought nerds were the nice guys