I can't speak for aaron, but 'Kraven's Last Hunt' was, for all its faults, a beautiful celebration of Peter and MJ's love for one another. Peter was missing for TWO WEEKS in that storyline, if Mary Jane could endure that, well, one got the impression she could endure anything. Mary Jane acted like Peter's beacon during that storyline, and was likely the only thing that kept driving him along after what Kraven put him through. To think they'd break up over something that storyline (arguably) addressed and resolved, well...it seems cheap. Of course that's probably not what lead to the break up, but it was clearly a contributing factor.
I won't ask about the banana nut bread, despite my curiosity...