We'd met online and pretty much by accident... he helped me design some lab equipment, and I think some of my teaching stories amused him. By the time we met in person, we knew each other to be basically kind people, and I was pretty sure he was genuine -- nobody worries about his friends' kids when there's a divorce (and volunteers to baby sit during court dates) unless he's got a kind heart.
We wound up in a science museum early on; the major exhibit in the life sciences area was on bioethics, and there were a number of open ended questions like, if a person was a kidney donor in their 20s, and then needs a transplant in their 50s, should they get "bonus points" for that earlier donation? Our responses to everything were remarkably alike.
Later, when my mom's health failed, she came to live with us... the one remark she ever made about our marriage (she was agin' it at first) was that she loved to hear us laughing together...
We are very different people from very different life experiences, but we somehow manage to make it work very easily.