I was just talking about this type of thing to someone else.
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The main thing is you need to set the expectations for what is going to happen with you before you escalate. Pretty much when you're with a girl and getting her attracted, right before you kiss her. You call a quick timeout to "review the play" so to speak.
You basically are up front and tell her you're not wanting a relationship right now. You are wanting to just date people until the "one" comes along, and when that happens you'll stick with her. That way you can casually date - f-close whatever. You'll be suprised at how many women are cool with this being upfront. For those that aren't no big deal, we can find another.
Not doing this ahead of time creates these problems. You'll have to just go back and explain it as up front as you can to her. In the mean time work on doing this to avoid these problems later.