Spiral downwards?

i don't think i could ever be in a relationship if this is how i feel at the moment. he has made me feel so shit. i like him and he flirts soooo much with me, but he doesn't like me back i don't think and it's making it really hard as i'm getting mixed messages from him. i just feel like bawling my eyes out which is sooooo stupid, but i thought this could finally be something that is going right in my life, but know. i can't believe this. when will something good happen? i can't do this. it just makes me feel so awful and even more self-conscious. i don't want to eat. i want to self-harm. is this going to send me into a spiral downwards?!