Scorpio, I think that Sally Brown hit the "relationship" nail on the head! I think on line dating can be a good place to look outside one's general area for a potential partner, but when a person is responding in writing, she can come across a lot better than when she is face-to-face with you or talking on the phone.

You've mentioned before that you've worked in therapy on finding your boundaries and maintaining those boundaries. This incident is probably one of those situations where you got to find out how good you are at maintaining your boundaries in a healthy way. You were eager to talk to this interesting and intriguing woman and you probably wanted her to be all the things you're looking for in a possible intimate partner, but she wasn't. Unfortunately, she was able to aggressively push against your boundaries (entirely normal and healthy boundaries, by-the-way), and you caved against your better judgment. BUT once you were able to step back and look at things, you realized how aggressive and intrusive she was acting and you terminated any further investigation of the potential for this relationship. Good self protection!
Next time, you'll remember this incident and you probably won't be pushed into revealing anything you don't want to until YOU decided the time is right. Hang in there. The right person is out there. It's just going to take a bit more time.