So when we met, our backgrounds were opposites," Shepard, 37, told .
"All the things I'd done were terrifying to her, and she had a hard time believing I would ever be able to stay married and monogamous and a father and all those things.
For the first year and a half we were together that was what we battled over almost weekly." PHOTOS: Odd couples What kinds of things did Shepard do that scared his bride-to-be?
And although the costars seem like complete opposites, Shepard argues that that's exactly why people should be happy for their relationship.
"Here's the funny thing about the response I've been aware of to my dating famous people: It's been very negative. If Brad Pitt gets Kristen Bell, it's like, ' Well, of course he did.' With me, it should be, ' Oh good, a normal-looking guy got her.
I'm either not good-looking enough, not a good enough actor or not successful enough for these people," the actor said. Maybe I'll get me a Kristen Bell.' But guys hate my guts for always dating women I have no right to be with.
Mostly my love was Jack Daniel's and cocaine," Shepard recalled.
"I lived for going down the rabbit hole of meeting weird people.
Of course, come Monday I would be tallying up all the different situations, and each one was progressively more dangerous.
I got lucky in that I didn’t go to jail." PHOTOS: Costar Couples Shepard and Bell, 32, have been engaged for over two years.
magazine, Shepard is the first admit that they were -- in the beginning.
PHOTOS: How Kristen and Dax fell in love "Kristen's a good girl.
She grew up very Christian, went straight to college, did great in school and started work immediately.
She's charitable and philanthropic and rescues dogs.