This just a Pisces psychic hunch but my guess is that somewhere in your mind and heart you believe that anyone who claims to love you will abandon you if given the chance. I think you create chaos and make it easy for the other person to leave, thus proving yourself right and cutting to the chase. You force your hand and get to hurt as quickly as possible so you don't have to wait anxiously for what you believe and you think you know is going to happen. That you will be left alone and misunderstood. It's no fair to treat another human being badly just to test your own beliefs. If you really care for this person treat him the way you want to be treated. If he leaves anyway then trust the universe and know that this just wasn't meant to be. Take care.