Andy401  
I am perfect, and have never failed at anything I set my mind to, including picking up an e-cig and never, ever faltering and reverting back to cigarettes, and oh yes, pigs fly.  
Andy, its not a failure that you went back to cigarettes, just a bump in the road.  Nothing says you cant continue picking up your e-cig in between bouts with the 
tobacco, and quit beating yourself up for finding comfort in an old friend (even if it is a tube of tobacco) in your time of need.  
Im so sorry for your broken heart, and while its easy enough to say the words everything will get better, it just doesnt make much difference when youre in the middle of it.   The only thing for it is to embrace those moments when you can see the sunlight, however brief they may be, and allow yourself time to grieve in between.  Hopefully, soon enough the sunlight will be more plentiful than the darkness, and youll feel more like the person youre entitled to be.    
Just know that you are in the thoughts of many, and we wish you the best both in your grief and your struggle.