Lisa - this is all easier said then done...nothing about this is easy or fun. Your lonely in the face of his so - called excitement.
Try not to assume he's having fun or living it up, we really don't know what there doing, but really it's not the best time of their lives. The're lost and if he's drinking that already shows you he's not that happy.
The past can't be ahead of you in the future. You don't have to figure it all out, just pick a direction. What's next...I don't know but I can't wait!