My crush likes my best friend! Or does he? Please help a desperate young girl find happiness!?

So for a long time i had a feeling that this boy i REALLY like me too. Well that was until he asked my best friend out. But the thing is i dont think he really likes her. I have reasons to believe this because his sister is best friends with her and she has been trying to set them up for a long time. Also he texted me askin if he should ask out Micah(my best friend) or Mandy(my teamate in softball) I said,"Micah??? u like her?" he said no but his sis wanted him to ask her.(by the way Micah likes him too) We made an agreement that whoever he liked we would be happy for each other and we would always be friends. I can't really say that now. Im so depressed becuz no offense, i luv the girl, but shes at that stalky and awkward age. I just dont get why he likes her and not me? do you think he really likes her? is there any hope for me? how do I tell her what i think about this? How do i let him know? PLEASE HELP ME!