Paul, I agree I should have said "we got in the second time, but I dropped out a week later". I apologize for not being clear but I don't accept that there was anything wrong with what I said.
To be clear, the side project of mine which took off was co-owned 50% by my another founder who was not involved in YC and didn't want to join, so it wasn't mine to simply share with my YC team.
There were 3 cofounders who went to the YC interview - there were 2 cofounders remaining after I left. I was transparent with both of my cofounders and we remain friends to this day - they had zero involvement in the side project from beginning to end. I specifically asked each of them if they felt I was behaving unethically - they responded that they don't believe so and would have done the same in my shoes.