Yes, rejection should never bother you. Rejection is part of dating - it's part of the 'game' for lack of a better word... it's kind of like baseball... great hitters are only successful about 3 out 10 times - they strike out a lot.
It's not a big deal - AND IF you can accept it initially you just MAY changes the feelings she has for you - if you act like it's no big deal - she may see you in a new light. CONFIDENT guys laugh at rejection and move on.

She's still with him... not the first time its happened oh well

Lots of fish in the sea. Lots of fish. She may not have been the right person anyway... BUT, be her friend - wait it out - most relationships don't last. If/when she leaves ask her for coffeee... always make her laugh, always.

I have some tips for you on how if/when she leaves the guy.

Keep looking, that's half the fun, just think of all those females out there for you to choose from.:cool: :D