For me, NRE wasn't too hard to handle. I guess I've had some situations before when I've had a crush that I've behaved in not-so-nice ways simply due to not knowing how to be considerate towards my existing partner. Later I felt horribly ashamed about that (though nothing really bad happened), and have absolutely no desire to repeat the experience. All I would advice is to pay extra attention to possible existing partners when in NRE. And to glow a bit but not be too obsessed about the new and shiny, i.e. to concentrate on the person you're with or the activity at hand, even if it feels hard at times.
Partners with Alec and Mya