So why did they break up?

[sue]

I also think that at the time Stevie was wildly excited with their new fame, where as Lindsey wasn't....The music and production was the all important thing to him.

Stevie like the adulation and he just didn't get that, he liked to be in control of most things and suddenly he was not in control of her.

I don't know for sure but I think he's the quiet introvert and she's full of life and full of herself, once they were famous that was the kiss of death for their relationship..