HELP!!! My friend is out to get me!!?

ok so my two best friends were dating a while back (like in Oct.). and i had the biggest crush on shane the whole time he was dating angela. they dated for about a month then some rumors went around and Angela left shane for another guy. i remained friends with shane. i dont like him anymore i like my other friend, john. well angela says she's over shane but is all upset and thinks i'm trying to hook up with shane, when she knows that i dont like him. and she's jealous and so she's trying to ruin my chances with john... WHAT DO I DO!??!?!