Relationship ended bcuz of my depression...

after struggling with depression on and off for the entire relationship, my girlfriend just ended it after 7 years. she also has had her own battles with depression/anxiety in the past to the point where i had to take a break from her, but i believe in 2nd chances and took her back. ive been struggling with depression our entire relationship and never got the help that i needed, or took her seriously when she would ask me to get help. i would often self medicate with drugs to cope with my depression but that only made things worse, my drug use got so bad to the point that i ended up in rehab, but she still stayed with me after that. but my depression kept showing its face and it was effecting our relationship, but i was blind to it until now. it took her leaving me to seek help and get into therapy and take antidepressants( which i was always against taking) even tho i do feel better mentally and i know im growing and learning from this, the heart break of losing her and not putting her 1st is almost too much to bare. i planned on marrying her, i knew she was the one bcuz shes the one that pursued me when we first met, and a month before we broke up i even picked out her engagement ring. i just hope and pray that some day she gives me a second chance to show her that i am capable of change, i am capable of being happy, and i am capable of giving her the life she deserves after 7 years...