Earlier quoted context omitted.
I can relate. I actually had a friend tell me "if you ever think of killing yourself, get in touch with me" after an acquaintance committed suicide. Well, I did have a depressive episode and got in touch for help, but got radio silence. Soon after the friendship was dead, he lost interest and couldn't hang out. Now I rely on therapy only.
I don't want to excuse your ex-friend's behavior, but I'm afraid a lot of people have no idea how to be of use to a friend who's going through such an episode. Suggestions to those who don't know what to do: Can I take you out to lunch? I found a new spot I think you might like. Want to go to and take a walk? Want to play catch? Want to come over for dinner? I was hung up for a long time because I don't know how to s…
In my case I wasn't even that in need of an ear, as I had a therapist on speed dial. I just wanted to see someone, for life to go on. The sudden distance, silence and unmade plans made me feel like a leper.