I'd say the cheating spouse one if actually a pretty good analogy here. The relationship is never quite the same. It's not to say you can't have a happy relationship afterwards and live happily etc, but it's never quite the same. I'm not sure if you ever really trust the person again. It does feel a bit this way with Benitez.
To continue on that analogy though, in those situations whenever there is any disagreement, it will always be referred back to. A bit like the small team/club thing. It's always going to be referred back to.
A couple of other points I'd add, is the media can have a field day with it. Any time Everton set up defensively away from home, that is going to be the question from the media isn't it- "did you set up to play as a small club today Rafael"? That was always the stupidity of his statement- that clubs with lesser resources have to be pragmatic, and this fella is about as pragmatic and defensive as you can get, even when managing a side with loads of resources. It might not eve be Everton fan's who cause an issue, but it is a big rod for his own back now.
The other point, is he normally gets away with his divisiveness because he can claim to get fans on board. I don't think he is going to be in that situation here at all. So some of his tricks he tries to defect attention just aren't going to work.
A bit like Allardyce, I really wouldn't be surprised if things go quite sour quite quickly, and not because of his LFC connections per se, but because of the mans character and his inability to manipulate things to suit his own ends. He is quite a dislikeable, two faced and manipulative person (a bit like Allardyce) and I think that will shine through quite quickly.