A pretty woman is never in a state of absolute singleness
So when she breaks off her relationship with you because she wants to be single and work on herself
What she means is that,
I need a breathing space and the freedom to entertain men of higher status than you

She wants to be free of commitment
Think about it
If she is in a serious relationship or married, there is no way she will tell you she is going out on a Friday night without you bombarding her with series of questions

So she breaks up or divorces to get back into the relationship market
She loves the street, she believes she has not explored and exercised her options so she wants to
I have seen a lady dump her child and husband, move to another state just to be promiscuous

If you as a man ever find yourself in this situation
Don't beg
Don't argue
Take your L and go build something whilst she wastes her time
You will be fine