Some of the relies on here are terrible, i do believe the op was genuine, and i understand it,
Also nothing to do with hormones, and its more than a crush, it is a very painful thing to go through, the person you are in limerance about occupies your thoughts 24/7
Difficult to explain, but its not always about someone you just fancy it is usually about someone you are or have been involved with in some way,and not always been nice to you,
It is often a narcissist who can make your life seem good then ignore you for no, t apparent reason, until they want to become involved with you again,they mess with your head,