It is believed that Grant Hackett's breakup with girlfriend Maggie Keating is what led to the former Olympian's meltdown this week.
“He falls in and out of love easily,” a friend told the Daily Telegraph. “He needs a girlfriend and finds it difficult to be on his own.”
It has also been reported that Hackett was involved in a serious incident at US swimmer Michael Phelps' wedding reception on New Years Eve.
“He got angry,” a friend told the Gold Coast Bulletin.
“He was wasted. She was crying. He was angry. Security guards restrained him.”
After being released from Southport Watch House without charge on February 15, Hackett's father declared the trouble swimming star missing.
“I would think that if anybody has seen him to contact media or the police or the Hackett family.
"He's definitely a missing person. He's mentally disturbed and needs urgent help. His doctor can't find him, he hasn't kept an appointment with his lawyer.
"When we spoke to him several hours, he just hung up when we asked him where he was. We're extremely worried about him. Grant, let us know where you are, we love you, and we want to help you."
He was found safe hour laters.
Hackett has also claimed that his brother, Craig, beat him.