The Myth: "Spike encouraged the relationship even though
he knew it was bad for both of them."
But it wasn't bad for both of them. It was actually helping Buffy
to deal with everything. Up until Wrecked, she was pretty
frozen, emotionally. But after that, she began to take an interest
in Dawn again, she got off her ass and got a job, she started to
laugh once in a while, and she didn't look like the walking zombie
dead all the time. Of course, she was also being the Abusive Boyfriend
From Hell at the same time. But Spike was with Drusilla for a hundred
years and more. Taking abuse from the woman he loves is what he
considers the norm, and it's to his credit that he was starting
to see that maybe that was a bad assumption to make. So as far as
Spike was concerned, right up until she told him otherwise, their
affair was thawing her out, making her feel again, and that was
good for her.