Why is love so unpredictable?

Yeah it is, no matter how you try to look "cool" there's only always somebody who'll make you go crazy and get you out of sync. but with experience, you can endure this, and try to be "cool" though you feel different inside. If you think about it all the time, the more it gets to your mind. Find a way to spend your time (hobbies, exercise etc) and not think about it. You say its forbidden so get over it.