Rettstar re "Today I came across a man who contacted his ex to find out why she broke up with him several years ago.
She cushioned it, she was working and studying, not enough time was able to be spent with him and oh, you're turning into a girl, and I'm not into girls."
You don't need to say but I'm getting the impression this was some sort of group on Facebook and it sounds like the man and the woman were both on it?
If so, I find it really horrible that anyone, male or female, would seek to question an ex boyfriend/girlfriend/partner on a forum/Facebook in front of others. If that is the case it is very selfish.
The only answer that woman owes that man is that she doesn't want to go out with him/live with him/be with him!
We may choose to say why, we might say the truth or a cushioning phrase like 'it's not you, it's me'
But at the end of the day, transitioning/ not transitioning/ thinking about transitioning/ not about transitioning etc etc, these may inform our choices but for me the choice to say why is still with the person who has done the breaking up.
Of course it is good for folks to know why relationships end, but it may be quite complex, and the danger of saying it is because of transitioning might be the partner says 'OK, I won't transition then' but that still will not put things back as they were.
I just find it really horrible that still in the 21st Century women, especially, need to have 'an acceptable' reason for choices they make primarily concerning themselves.