Well of course you guys were right!
To explain the whole story I'll have to start at a while back.
My girlfriend is very pretty and has always been popular. A year ago she got a skin disease, which meant that she had to take some very powerful drugs. She had tried it a couple of years ago as well and back then she got a depression because of the drugs.
Unfortunately she got another depression after talking the pills and got another really bad depression. This alongside with me not being a very good boyfriend was too much for her and she said that she would leave my if I didn't do more to be with her. Before then I was often with my friends, doing other things and necleting her, because I was sure that she would be there for me, because she was crazy into me and wanted to spend every second together.
From this point I changed because I deep down felt that I really loved her and wanted to help her get over the depression. I kind of got afraid to be an asshole and started do agree with her too much and being afraid to loose her. Because of the depression she changed as well and became emotionally unstable. She wasn't the same happy girl anymore and lost interest in a lot of things - including me

I responded by doing even more for her, and being the perfect boyfriend. In retrospect I should not have changed my self too much and have done all these things. In the beginning of the relationship I was super confident cool guy, and in the end I was a jalous insecure guy.
This mounted to her being very insecure about our relationship, which she told be some days before she went on exchange. After one week she called my (texting had been good and so on), to tell me that she missed me so much and that she wanted me to come over. I therefore booked expensive flight across the world for april and I thought that this was very good.
Her depression hit her then because she started drinking a lot while being on her depression meds. This makes people go crazy, get even drunker, horrible hangovers, and it can leed to a state of manio depressive. Each weekend when she got drunk she told me she was happy with the others, but always sad the next day when we SPAM. Finally this weekend she admitted that she made a mistake and kissed a guy. She said that she was sorry and I of course broke it of with her immediately.
After calming my self down we wrote together and she said that she was in a fucked up place in her life, and that she couldn't be the girlfriend i deserved. She hated what she had done to me, and repeatedly told me that she loved me, but that she right now needed some space.
I haven't wrote to her since, but her parrents (who loves me) wrote and said that they were so sorry about what happened and that they were worried about her as well. She apparently talked about getting tattoos, piercings and everything... which was strange because she never used to be like this.
Even though all of this has happened I still love her so much. From the day she got that depression everything changed, and I think it sucks that this depression is partly what has made this relationship go downhill. I didn't help it by beeing needy, and insecure the last months....
Now I want to ask you guys again, since you were right the first time.
How can i get this girl back? She is the love of my life, so even though the most sane option would be to say fuck this girl and never ever get in contact with her again, it is not an option.
My own thoughts are:
Try to get on with my life ASAP.
It will not be possible to get her back be texting and calling her. It will only push her further away. Therefore I am not going to contact her for at least a month, hoping that she realises that it was a mistake
Maybe delete her on facebook, but it is very drastic, because it is basically our only communication platform. On the other hand it makes me scarce
Any other good ideas to how to get her back. I can forgive her for the kiss and I know she han't fucked anyone, she would have told me on SPAM after I broke up with her (She almost cried/screamed nooo xxxxx I hvan't when i asked her about it...
FML - need a little help