What is the point for a girl to go through the trouble of going through a talking phase and dating phase with a guy to get an ex jealous?

I recently met a girl that was a single mother.


She asked me if I had an issue with that concept and I told her given my age, it doesn’t bother me. So long as the father is out of the picture.


Long story short I noticed clues to pointed to the fact she was using me to make her ex jealous. Why would a girl do this (besides obviously still having feelings for the guy) ?
What is the point for a girl to go through the trouble of going through a talking phase and dating phase with a guy to get an ex jealous?
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