That betrayal must cut incredibly deep - not just losing someone you loved, but knowing you sacrificed such an incredible opportunity for someone who didn't value your commitment the same way. The hardest part about these kinds of regrets is that they teach us painful lessons about putting our dreams second to people who haven't proven they deserve that sacrifice. While you can't undo this choice, remember that opportunities like NUS often come around again for people with the talent to earn them once - and now you know to protect your future self better.