Last season we learned that his wife ditched him when he got too involved in the case of the cosmonaut that turned people into dust sculptures.
ETA: oops, looks like I got the Quote function wrong…sorry!
When the series first started, I was very “meh” on Olivia…
but now
…Olivia is a frakkin badass people…jus sayin
Thank you! I had forgotten about that.
She is the awesomest.
What a great action hero, right? Brains, beauty and exceptional ability to stop bad guys in their tracks–all in one sexy Nordic package? Yum.
Haha, nice. Only got that one since I started that series this year. 
There’s just one problem with swapping the Olivia Dunhams of two universes and embedding the “wrong” Olivia with the Fringe team of your alternate universe: She’ll kick so much ass, everybody will come to love and trust her. Spoilers ahead.
My non-sci-fi friends and I have a weekly date to work our way through the DVDs. It’s a great show!