<human>: Provide a brief overview of the text.

Hi reddit. I am a 21 year old male who has a bit of a problem. I've been in a long distance relationship since high school, and during that time I've had several (4-5) good (female) friends of mine come onto me pretty strongly. It pretty much goes like this:

* We talk (I'm sure to mention that I have a girlfriend, how awesome she is, etc) and they get the hint that I'm taken.
* Things go well for a while, we get to know each other and hang out more often. We talk about everything with each other: favorite music, movies, books, our worldviews, past experiences, relationships etc. Basically a normal friendship, and if the friend was a guy there would be no problem.
* Something happens and suddenly I realize that they are into me. (fight with SO, getting really drunk, etc)
* The friendship fizzles out from here when they realize that I am not interested in cheating on my girlfriend nor would I leave her for them

I love my girlfriend and haven't cheated on her in the years we have been together (nor do I plan on it). I just don't want to be afraid of leading people on to think that anything beyond friendship is on the table. So my question is, basically, how do I keep my friendships with women friendships and not a reverse-friendzone - thus losing their friendship?

Posted to dating_advice because I don't know where else to put this.
<bot>: My friends keep coming onto me and I'm not interested, but I don't want to lose their friendships. What do?