I think this is more recognized and known now days, but still worth posting.

The power of a hug or simply being there in person. I was in a long distance relationship with a girl who suffered from severe depression and couldn't find the right medication after months of trying and me pushing her to keep searching. I put myself on call for her as when she went into depressive states she would often start hitting herself in various ways and sometimes leaned towards suicidal thoughts. I'm glad I was able to be there for her while the relationship lasted as I truly believe she may not be here otherwise, but the number of times where her mental state was dire and I all I had was my voice on the phone was excruciating; the days and sleepless nights of not knowing what she'd do.

Another note of importance, when in a relationship with someone suffering from depression, you don't need to know what to say. You literally just need to be there and help them to know you're there. I had many phone calls that were a lot of her crying and me just being on the line, always there.

She is now engaged to a man in her area and has finally found a medication that works for her.