<human>: Can you condense the text into a few key points?

19 year old female here. Since I first came to college, I gladly broke out of my sexual shell and hooked up with several guys over the course of a few months. I'm not necessarily proud (or ashamed) of this fact; the reason I mention this is that I think it somehow instilled an urge for promiscuity in me. A lot of my sexual fantasies center around this desire to sleep around, and I have difficulty with the idea of having one partner for the rest of my life.

I've been in a relationship now for over a year, and I've been able to control my urges up until now. Over the past week however, I've started looking at posts on [/r/ladybonersgw](/r/ladybonersgw) and [/r/r4r](/r/r4r) just to fantasize. Last night, I chatted with a guy on skype for about 6 hours and things got pretty heated. He sent me nude pictures, we talked dirty, etc. Part of me feels like this is just harmless flirting and fantasy, but part of me feels guilty.

At what point does one cross the line between fantasizing and infidelity, especially with regards to online chatting/cyber sex? Does this urge to connect with other men say something about my feelings for my boyfriend? How different is my situation from guys who watch porn while in a relationship?
<bot>: Been in a year-long relationship but still having the urge to have "cyber sex" with other men online. Is this cheating? Is my relationship in trouble?