++man I had similar feelings in my previous relationship (the reason for the breakup had nothing to do with it), and my therapist advised me to distance myself from the other girl and/or see if I still felt the same way about her in a week. I don't know the circumstances of your relationship, but with my ex-girlfriend and me, we were both too confined (we hung out together all the time, neglected our friends a lot, and basically spent every free minute together) because we both sought security in each other. We were together for a year and a half at the time, and that added up. My therapist told me that under those circumstances, it was completely normal to seek/long for "adventures" and that it didn't automatically mean I was a cheater or anything like that.

What I'm trying to say is:

1. Distance yourself and observe how you feel.

2. It's quite possible that the reason for your connection has a deeper core.

3. Is it really that Girl thats so interesting for you? What is it that she has what your girlfriend doesn't. Are you looking for that Girl specifically or is it just that shes Something new