What motivation would he have to say these things over a period of 3 weeks unless they were true?
Oh, I don't know. Maybe because he's a pathological liar?
And I do think he was there when she died, or fell ill. But I think he was also there when the body was disposed of.
I just he is incapable of telling the truth for more than one sentence at a time.
It’s very possible he just rolled her into the sea all by himself and then called for a ride home.