How to ask someone new questions about his previous engagement?

I’m in my early 50s. So is the man that I have a crush on. I recently asked him if he had ever been married. His response was no however he had once been engaged and thank God that didn’t work out. It was a disaster. In hindsight, I should’ve asked him then, a few follow-up questions. It just caught me off guard. I was expecting him to say yes or no. Now I don’t know how to go back and ask him things like how long has it been since that relationship ended? Have you healed from that? have you dated since then , I’m so kicking myself in the ass for not asking follow-up questions of that moment.

How to ask someone new questions about his previous engagement?
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