When they hold eye contact with you!! Im super shy to my crushes but to other guys im fine with so my bf better be social! OMG AND WHEN YOUR BF IS MEAN OR RUDE TO EVERYONE EKSE BUT YOU or when hes super smart!! OR WHEN THEY ARE SUPER SUPER GOOD AT A SPORT AND THEY GET SWEATY SO THEY HAVE TO PUSH THEIR HAIR BACK there are so many ┗( T﹏T )┛