<human>: Can you provide a brief overview of the text?

Been hanging out with a friend for a while to the point that we have gotten intimate and the possibility of officially becoming a couple. I've completely fallen for her and she says she feels the same way. However, the issue is that she still sees her ex/on-off boyfriend. It's complicated as they haven't really broken up. 
They still meet up every few months as he lives in a different state.

She says the reason they aren't really still together is because of the long distance and that she doesn't see any future with him eg. He doesn't want to start a family.

She's willing to end things with him but at same time would still like to continue talking and be friends with him if we were to date, as she says he's like a best friend.

I am in a dilemma whether or not this is a relationship worth pursuing. My concerns are that they probably still love each other as their breakup ended just on long distance and differences in what they want in future. Their reasons of breaking up seems not enough to end their relationship. What if she doesn't love me as much and only reason she wants me is that I'm a secondary choice. If her ex decides he wants a future, what if she just dumps me the moment and get back with him?

If I were to get in relationship with her, would it be ok to tell her to cut contact with her ex?
<bot>: should I get into an official relationship with a girl who still has a on-off boyfriend she's still in love with?