Thanks for linking this S. I've read it before but great to have it to hand again. "I'm not unhappy here.." "my heart feels as if I'm going in the wrong direction, literally and emotionally.".........I do think she perhaps may have wanted to move back.
It's only relevant to me if this is part of the trigger for IS as it's certainly not what IS wanted. (Such a pity that neither of them seem to have had the kinds of really close friends that we have, who could testify that there had indeed been discussions. )
There's still time to hear from friends. Helen did have friends like Tracy, and if she could write of her feelings about moving so publicly, she would surely have confided in someone like her.
I notice from that article that the Stewart boys would have been 18 and 21 at the time of the move, so it is indeed a shame that they didn't get a flat in Cambridge for them.