My best friend went to homecoming with this guy, Kyle! She told me he would never date him and she just liked?

him as friends. as i started gettin to know himi fell for him, and he liked me to. I talked to her about it and she said she was happy and she didnty like himi like that at all!! then after we started datin she told me she really still likes him and now she cries herself to sleep sometimes, because of him. and i dont know what to do i REALLY! like kyle and she says she fine but what do i do??