Probably just that you're lonely and fear losing the friends you have
Sorry, I can't view the details from my cell phone, but most nightmares are provoked by anxiety.
It means you are gay.
Dreams usually represent what you most want or most fear. I'm going to assume in this case it's the latter,and as Mittons said, you're worried about what losing your friends would mean.
People say that nightmares and dreams mean something, and that nightmares kind of prepare you with bad things. Erm, that's what I've heard. It could probably mean something. But I'm sure that what it means is something that you could eventually figure out, and maybe it's something that you have to find out, if you search. Then again, maybe it doesn't. I'm sure it has a purpose though. x)