Girls! Help! Im 15 and need help.?

So this girl i like, we've been best friends for a long time, and we talk alot. So she tells me she likes me last weekend, and from then on and before we were texting alot and talking to each other alot. I say alot of nice things to her, and there cute. I try really hard cause i like her so much. But things didnt go out to well last saturday we hung out. I dont know what i did but she talked to her best friend and she texted me today saying shes having mixed feelings. She also texts me saying how ever since she found out i liked her, that shes been trying so hard to remind herself she likes me, and basically shes been lying to me about our relationship. Im so incredibly sad, I thought i was trying to get her to trust me, when the whole time, I should have trusted her. its sad cause im a guy and when i got that text, I got teary eyed during a test. Im not sure how i should be feeling, cause im kinda angry but i like her so much. She says she feels like an idiot but i feel like an idiot.