I was wondering whether at some point she started refusing to respond to his calls and texts. She may have made suicidal comments and then stopped communicating altogether. He began a search for her and may have finally found her body on the beach at which point he makes an impulsive decision and goes into the water himself. I know nothing about ocean currents so maybe his body floated out to sea? Can people find each others "I-phones" using that "Find my Phone app"?