I miss my ex wife
Why do you miss her?
We had a lot of good times together.
There's nothing wrong with missing an ex.  Just be careful not to get stuck in the past!  There's many other fish in the sea, you know?
Yeah, right. But what are the chances of me finding a girl like
You might not find someone like her but maybe you will find someone who is a better match. It is okay to miss her sometimes but do not focus so much on her that you miss out on something good.