The reason that you want to reunite with your husband is the best for transfer. You should pay more attention about your advisor's thinking. If he thinks you are reasonable for your transfer, you will be successful. For your advisor at now, if he thinks you want to leave for your family, he may just let you go. Maybe he or she will tell your new advisor your real behavior, but the most important thing is you should give your new advisor your reason about your behavior and trust your ability in the future.