"You can't breathe and you feel like your chest is collapsing, the walls are coming in on top of you. My brain doesn't work. My heart's broken," the Daily Star quoted Keating as saying.
"You just feel crushed. It's been horrible. We've all been feeling the same way since Stephen passed. Mentally I'm absolutely exhausted," he added.
Keating flew out to Majorca, Spain to escort Gately's body back to his native Ireland, and acted as pallbearer at his funeral.