Heelp meee!!!

Regarding Keith: It seems like that was a one-time only "incident." Perhaps emotions were running high--you mention this occurred at a party at the end of your trip. If that's the case, and he keeps ignoring your references to it, then let it go. It sounds like you're still friends, based on the fact that you're still in touch w/each other. I think that's the way it's going to be. I'm assuming you two don't live near each other?

As for your brother: You don't mention your ages, but as you were on a school trip, I'm guessing you're in your mid-teens, and your brother is a bit older.

You're right in that he prob. senses "something." Family can be weird about each other, esp. when it comes to romantic/sexual matters. He probably still sees you as a little kid, and he has conflicted feelings about the fact that you're actually a young woman.

Furthermore, not to generalize, but your brother also knows how loutish some guys can be, and I bet he can't stand the idea of some guy being a jerk to his sister. It doesn't explain, however, why he's being distant to you.

How long ago was this trip? As you recently posted this question, I'm guessing you just got back?

Anyway, if he's been distant for a couple days now, I'd think that's enough. I'd approach him, and start a conversation in general, like "we haven't talked in days. What's up?" And go from there.

Good luck!