<human>: So gonna keep this short and sweet (hopefully) so here goes.  just got back from vacation in down under and things are strange back home.  While out with the guys one of my buds lays down a suggestion down that my bestfriend hooked up with my GF. We're all just chilling and they're catching me up on all the things I missed and the parties I missed when one friend abruptly turns to my bestfriend and asks him "did she have hot, medium or mild salsa lipstick haha?" My girlfriend is latino and the only one that my group interacts with so it seems like it would pertain to her. Then my best friend put the other guy in a headlock and said " damn aren't we just great friends" while looking over in my direction. I don't think they know I heard cause i played it off as if I wasn't in hearing range (other side of the table and half in conversation with another friend).  Also, my girlfriend hasn't texted my at all in the week that I've been back, which is strange since we usually text every night.  I had a bad feeling that she had cheated on me when I got back and usually my gut feelings turns out to be right, but I'm not sure how to handle this situation. I'm not sure if the salsa thing is good enough evidence and i don't know if I'm over analyzing things, but I don't know how to handle this situation.  I'm not the confrontational type so I don't really see myself openly asking my bestfriend or gf about it so i was wondering which root I should take this? Should I forget about it, am I being paranoid? Should I wait it out and see what happens? Should I try and get my other friends to open up about it? Should I text my gf as if nothing ever happened despite the silent treatment? I'm just very confused and unsure of what to do, I'm one of those people who's gut feeling is always correct.

Can you summarize the given text in a few sentences?
<bot>: gf and bestfriend may have hooked up while I was in Australia, not sure if they did, and not sure how to approach this situation.