Yup :) Brian is sooooooo far gone over Justin, he would never not 'take him back' eventually.
YES! YES! YES! but I think the key is EVENTUALLY. (We are talking if Justin left the relationship, not just moved location)
I think Brian is too caught up in his image not to make Justin work for it. He would not reject Justin or try to humiliate him but I think his pride would require something demonstrative from Justin.