Its not your fault that you have feeling your only human. It is never easy to let go of someone that you were commited and let yourself open up to especially if he was your fist love, master or not. You should not feel guilty for loving, If it is getting in the way of your relationship now you might want to discuss this problem with you master and try to make him understand where you are coming from....i dont know but all you can do is really try to move on and reasure yourself that whatever you had with your previous owner is now over and nothing you do is ever going to change that and the best thing for you is to move on and look to the future....as a good friend once told me it is to bright outside to stay locked in the darkness of your room you need to get out and explore or you will never know the wonders that are in store for you!!!!