It's possible they lurk but they can't control this site which is why there is no point in trying!
Yes, it can be another form of manipulation. They ones likely to commit suicide don't talk about it on twitter, they just do it. I believe people were contacting him when he was in Oz and they were worried for Alice. I think it was her "cry for help" and she was not really suicidal. I would say he did try to help her but in the end he couldn't do it anymore.
Of the two of them he is the most stable. That said, (I can't find it now) but in Woman's Weekly I read that he would cry after doing a take if it went well. I think his confidence was badly affected by being the breadwinner but unemployed for 2 years. So he has his issues too and I think AE was just dragging him down, feeling resentful that he was away working so much. I don't think she appreciated what she had and now that she has lost it, she's raging.