I used to believe I had an ex-girlfriend in Chicago, but once that person came out as nonbinary trans with he/they pronouns I now know that I have an ex-boyfriend/ex-theyfriend in Chicago.
You, from your perspective at that time, did not. History cannot be retconned. You had a girlfriend, and that person changed their definitions at a later time.
I used to believe I had an ex-girlfriend in Chicago, but once that person came out as nonbinary trans with he/they pronouns I now know that I have an ex-boyfriend/ex-theyfriend in Chicago.
You, from your perspective at that time, did not. History cannot be retconned. You had a girlfriend, and that person changed their definitions at a later time.