<human>: Can you condense the text into three sentences or less?

To make it simple, the now ex [F] of one of my good friends and me [M] flirt with each other all the time. text constantly, and she calls me every now and then. My problem is that I really like her, she is a really nice girl,  just my type, and Im sure she likes me, but she is the ex girlfriend and have a son with one of my good friends. What should I do? Going to him and telling him is not an option. Should I go for it and keep it hidden at least from now? What do you guys think?
<bot>: friend's ex and me flirt and kind of wanna hook up, but don't know what to do because of my friend.