Dating

I was planning a date with this girl and found out through stalking her online that she still lives with her ex? Should I call it off?

We've only met three times, the first two were work related, but the last one was explicitly a date. She was clearly still entangled with her ex during the last date, so i tried to take it casually. We haven't kissed yet but we've explicitly expressed our interest in each other. She has been really enthusiastic about meeting again so we planned to meet next weekend. She told me she had moved to another city so i thought she was at least a couple hours away from her ex, so i planned on paying for the tickets and a nice date. However, today i looked up his ex online and found out he moved with her, and currently lives with her and other of her family members on the new city. It feels degrading to be paying for a girl that is still seeing her ex. Is this sufficent reason to call the date off? Should i let her know that i know she still lives with him and tell her to contact me after he's moved out? She'll know i stalked them if i do so, but it might be the only way.

I was planning a date with this girl and found out through stalking her online that she still lives with her ex? Should I call it off?
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