My girlfriend has broken up with me...and sadly it has taken this to happen for me to realise................?

I suffer from mild depression,& been on medication for few months (I stopped taking about 3 weeks ago). We got on great, loved each others company,& were just really happy as a couple. She broke up with me a few days ago, as a result of my behaviour towards her, when we were out in the pub. I took the huff with her over something very silly, refused to speak to her, & got really drunk. The next day she told me I said alot of nasty & horrible things,& she felt scaired of me.On top of that I have been moody towards her, been in and out of bouts of depression, & generally not being much fun to be around.I have been abusing alcohol alot recently,getting drunk most weekends,drinking during the week,going out to the pub on my own and getting into all kinds of states.I have been too self absorbed in myself to realise how my behaviour has been affecting her.Im not a bad or normally nasty person.I now realise that I have not been helping myself, & really adding to my problems...................