Some people thrive on tension, uncertainty and drama.

That's never what happens when someone enters the uncertainty zone in a relationship. I don't have it in me to go deep enough right now, so here's the shortened version:

People need people. Not "love to have" - need, 'cause we're social creatures like that. When you find someone who fulfills that need in a way you see fit - whether it's "stay one night every week" or "live with me" or anything else - it's very difficult to let go of such a person. There's a reason love is mystified into something much bigger than it is in many cultures. Some people need love more than others - possibly because they haven't been given enough as children - so they're willing to tolerate (not "thrive on") uncertainty if it means that there is hope for the other person to stay and love them.

So, your saying "Dump her" just says "Leave the person you think you want to be with". Pragmatically, good advice, very straightforward, but it does nothing to address the underlying cause of such tension.