My best friend is dating my crush

So a couple a months back I told my best friend that I had a major crush on this but then a little while later she tells me that she likes him so my and this boy get really close and it’s like he’s starting to like me so the one day in p.e he tells me and single so then my other friend says I’m gonna go ask him out so I say I don’t want to hurt my best friends feelings ( at the time I thought she would do the same for me) so then at lunch that day my crush asks her out and without even thinking about it she instantly says yes and all I want to do is brake down into tears but I know is that I have to stay strong cause I don’t want to ruin this for my friend but what makes me mad is that she didn’t talk to me about she didn’t apologize or anything hasn’t said a word to me in 2 days I don’t know what to do