Yes. When I was on my Senior week with friends from school, I suffered second degree burns from being out on the beach for approximately 1 hour (with 75spf sunblock on), so I spent most of the time inside watching TV. I was bummed that I hadn't had the opportunity to take many pictures, so one night when they all wanted to go bowling, I decided I would tag along and take pictures of them, despite being in a lot pain. They kept asking if I was sure, and I said yes, that I just needed to use the bathroom and change my shirt. When I got out of the bathroom, the condo was empty, and when I stepped out on the balcony, I saw their car driving away.
I assumed initially that they hadn't heard me say I wanted to go, so I sat down and turned the TV on. However, after a couple of minutes I noticed a folded piece of paper, and opened it to read: "Wait until she goes in the bathroom, then we'll all leave."
I was absolutely devastated. I tried to call my family to come get me, but no one would. I finally found another friend who was also on Senior week who came to pick me up...but then people back at home got involved and begged me to go back, that my friends felt really bad, etc, etc. I went back, and there was no discussion about what happened (one friend did get smashed that night and kept crying and apologizing)...but when they dropped me off at home after our trip, it was the last time I ever saw any of them.
I have no idea what happened or what I could have done that would have made them want to leave, and it still bothers me to this day; mostly because I've had other similar experiences (I sat home alone all day on my 21st birthday waiting for a friend to call who had asked if we could hang out on my birthday...he never called, and he's never contacted me since), and have extreme abandonment issues as a result.
You should have taken all of their clothes and hygeine products home with you when you went.