From the article:
"Shortly before his death, Dymond sent Callaghan a text saying: "I can’t live without you. I just wanted to come and see you. I just wanted to say sorry before I go. My life is not worth living without you."
When a person really intends on committing suicide, they don't tell anyone what they're going to do because they don't want to be found and rescued before they go through with it.
What he did is classic manipulation: phone/email/text that you're going to kill yourself and leave enough time to get rescued, and hope that the person who dumped you will feel sorry for you and take you back and stay with you out of guilt.
Unfortunately, sometimes they get the timing wrong with the amount of drugs they've taken, which is probably what happened here.
I guess this is our last goodbye
And you don’t care, so I won’t cry
And you’ll be sorry when I’m dead
When all this guilt will be on your head
I guess you’d call it suicide
But I’m too full, to swallow my pride
I can’t, I can’t, I can’t stand losing,
I can’t, I can’t, I can’t stand losing,
I can’t, I can’t, I can’t stand losing,
I can’t, I can’t, I can’t stand losing,
I can’t, I can’t, I can’t stand losing,
I can’t, I can’t, I can’t stand losing,
I can’t, I can’t, I can’t stand losing,
I can’t, I can’t, I can’t stand losing,
I can’t, I can’t, I can’t stand losing.
I can’t, I can’t, I can’t stand losing,
I can’t, I can’t, I can’t stand losing,
I can’t, I can’t, I can’t stand losing,
I can’t, I can’t, I can’t, I can’t stand losing you
-The Police