How to avoid talking about my past?

A classmate of mine who has had a crush on me and who I was friends with, has been messaging me.

Today he asked me if I am still engaged or taken and I answered with just “No, I am not. Why?”

He told me he has heard by some of our classmates that I was getting married and is now surprised to know I am single and he asked me why we broke up.

Is not it too private of a question? I no longer want to talk about it. Why would he ask me that?

How to avoid talking about my past?
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