I wanted to ask for some outside feedback on this...

There is a woman who I've known for four months, and we became exclusive a couple of weeks ago. We did not meet through the dating personals, although we later saw each other's profiles on there.

I haven't logged on in a couple of weeks, but grew suspicious when she cancelled our plans for this morning, and so I logged on just to see, and sure enough she was just online a handful of hours prior.

I confronted her on the phone about this and she was startled. She said she had not logged on prior to today, and was bored. Some minutes later, she admitted to having logged on a few times, and that she likes to keep in touch with people from there, including female friends and some single guys. Incredibly, she has been meeting up with said guys and has not mentioned it to me (but she does normally mention what she's done with her day).

I expressed to her how uncomfortable this all made me feel, and she basically said it was my problem, and that I was jealous. She actually said my jealousy was unhealthy to the relationship! But I think anyone would naturally feel as I do in this situation, and the way that she is responding does not reflect someone who wants to be in a committed relationship. What gets me is that it is somehow a me problem and not a we problem. She got really quiet when I asked her what's going on and such, and became defensive. I got frustrated, hung up, and am not sure how to proceed at this point.

I'm glad she has a social life where she can meet some of her personal needs without me. I know I have the same, but it does not involve having a profile up on a dating site. That, to me, combined with all the sneakiness, seems really suspicious. Moreso, her reaction to my concerns about this seem more concerned with keeping the profile up than they do with me being uncomfortable. What does that say about our relationship?

So what would others do in my situation?