sobriety should help a little, but here are a few things you should remember, the first being you two broke up for a reason and lots of times it's the right person just the wrong time, so the only thing you can really do about it is think it over once more than set her to the side and move forward don't blame anyone or if you do end up with her again it will come out eventually, take some time to yourself figure out what you want your future to be and go after it, for only you can change you and your future just like only she can only change herself and her future, and who know maybe the next time you two meet you'll reconnect or maybe you won't, only time will tell! but the one thing I do know from experience is women love men that are motivated and moving forward through life and that when it comes right down to it nobody will push you to succeed in life but you! So my advice to you would be Hold your head up high and push on forward if she is the one she'll return and if not maybe you'll find the one who is! But if your always looking back you'll miss out on the future and worst of all the wonders of today!
I've been through plenty of heartache and when the girl I loved more than life itself returned to me I wasn't where I needed to be in my life to hold her again and I lost her again! Hope that Helps!