No, you are not a sucker! You're just confused and change is a HUGE step, but...
If he truly wants to be sober, he will do it whether you are there or not. Moving into your own place will also give you some distance from the situation and a chance to straighten out your thoughts. If he continues to work on his sobriety and remains sober for a year, you can always consider trying again. In the meantime, you will have the space you need to clear your head, and you may find that you don't want to go back to the unknown.