Ahh the Trivialities of everyday life. Every day we go to school and we hear about this person hooking up with this other person and so on, and we come to realise that... We might be jealous of that person. Then we think, NAHHH, and then we go on to convince ourselves that "they'll break up after IB", or "it's one-sided". How often are we guilty of this? I know I am. But of course now it's not so bad (not that I've found someone, it's just that I've resigned myself to single-hood, and besides, I'm not ready for another just yet).
Ladies and Gents, I put forth to you notion that school is school. This is bound to happen, in every society for that matter. One way of escaping this sort of mindset is to focus. Focus on the things which you find are the most important in your mental, and spiritual development. Jealousy is the cause of all sorts of trouble in a community like ours, especially when social status counts for everything (including looks).
So how? Deal with it. Seriously. Of course there are ways to do this so as to not embarrass yourselves at the same time, but this skill can't be taught. It is almost innate. And while trying to describe this 'skill', one tends to go "ahhh, ummm, errrr, ugghhhh". So don't try (unless you're The Craw).
That is all.