I am sorry. This is extremely saddening.
I personally experienced depression due to my extremely rough and abusive childhood. I felt lucky because at this point I sort of walked out of it. But for some people, they couldn't.
Just like my ex, she committed suicide by jumping off a building. I felt guilty for more than a year now. Guilty because we broke up in a bad way a few years ago and that probably led her to start experiencing depression followed by all the stress built up through her job and friendship problems. Guilty because I ignored her texts and calls for many times. Still, guilty. But I guess they feel better this way.
I am sorry and may she rest in peace.