Noone can cause a heart condition ST - not even an alcoholic - we're just not that powerful
I understand it's hard for you being so far away but I'm sure your gf will reach out to you when she needs to.
The very best thing you can do for you (and for her) is keep working on your recovery.
I found I had a far greater capacity to help others that I realised - but I had to get myself well first
D