No, tmf Sweetheart. You were probably plunged into the "Would'a'Should'a'Could'a" syndrome, in which you could have (later) seen all the ways you could have, should have and would have "saved" him. Or the dread "If only" cycle, in which If only you had said/done/known/fetched said item that person would still be here.

Not so, tmf. Let yourself off the hook. A suicide who carries it through means to do it. Wish them well and hope they have found what they want, at last. There is nothing else you can do.