Okay Ryan, 30 days is a very good idea, explain to him that you will be leaving because you are moveing back to Texas. Let him know you have been very happy working for him, tell him he has been a kind and thoughtful employer, but you must move forward with your life.
This should do it, I am in the managment field here at work, being the Executive Director of our center, I have held to deal with these situations
Angie