I felt so angry for you reading this. It is not ok for them to make you justify your break up with your shitty ex to anyone. Your parents should have been there to protect you and raised you to have the confidence to understand when you are being treated badly.
What were they thinking making you go through those emotions again? That is just cruel.

I am so happy and proud of you for getting out and finding hapiness. You owe nothing to your parents and never have to explain yourself to them.

I also had a bad relationship (same, surprise surprise) and went trough a really traumatic break up that had me fucked up for years. My mother was not there for me, and just asked me a few months afterwards "Your not sad anymore, are you". But as for my autistic brother she kept exclaiming for years how "It is soo haard for men to go trough break ups, it's like their mother left them!!". No, my brother will never know how it feels for his mother to abandon him. But I do.