My ex-friend is trying to ruin my chances with my crush. What should I do?

DiamondRuby
I've liked him forever, and my then bestfriend was the only person I told every detail of my (pathetic) love life to. He acted like he might like me back, but until a month ago, he had a girlfriend. After the breakup, he stopped hiding his feelings for me, and I thought I had a chance. I spent pretty much 24/7 with my then best friend, but about 2 weeks ago, she got jealous of another girl I was talking to at a restuarant and left without telling anyone. She fricken disappeared, and I thought she was kidnapped! Needless to say, I cut her off (don't need that kind of immaturity; we're almost 17 for Christ's sake) and we haven't spoken since. Well, mid last week, my crush became distant out of nowhere. All progress vanished in one day. We were like strangers again. Something happened. Today, I found out from other friends and my ex-friend herself that she's been spreading lies about me. My crush isn't petty enough to get into rumors, so whatever she did, it must've been sneaky and good. She's always been the jealous and immature type, but I didn't think she'd do this. TBH, me and many others question if she's a lesbian and this is her retaliation for me nearly getting a relationship (with a guy!) Either way, she's somehow sabotaging my chances with my crush. What do I do?
My ex-friend is trying to ruin my chances with my crush. What should I do?
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