AM I IN LOVE WITH MY BEST FRIEND?!?!?!?!?!HELP?

Bret* is my best friend. we know everything about eachother and we tell eachother everything.Im so confused....for the past couple of days..he's all i think about, i reguraly check my phone now to see if i have a text or call from him, i dont know why i cant stop thinking about him...when im with him im beyond happy, but when im not...im depressed, and if he doesnt text me back i get even more depressed.....am i in love? HELP