First of, when T/D were admittedly dabbling, they were 17 and 16. When they accquainted Isabelle and her brother in summer of '82, they were 24 and 23, and the dabbling must have been history.
Second, I can't remember any interview of Isabelle so far with her saying or even hinting that she was jealous of Jayne. I can remember reading that Isabelle felt Jayne was jealous of her (say, the other way round, what makes more sense to me, too).
Third, Isabelle was often quoted as saying that Jayne was 'the other woman' in their marriage. Given that she truely said that (we know the yellow press, don't we?) it doesn't have to be meant in a sense of romantic relationship. I guess she referred to Jayne demanding very much of Dean's time for skating, keeping him away from his married life.




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