Hi Aaliyah and welcome to SR.
I'm sorry you feel guilty and confused. I read your post and I empathize with you. If it were me, I would move and take the job for the following reasons:
1. That special someone would have to be very special for me to forgo a career opportunity - meaning I would really have to trust him. Honestly it sounds like he has eroded trust.
2. I would want to hear that he wants to marry me directly from him. If I heard it from a third source it would actually make me trust him less.
3. Some distance (and time) may inspire him to sober up and decide he wants you back in his life. I would let him take the initiative!
But everyone is different. You need to do what is in your heart.
You may find support in the Friends and family section of the website.