Once.
It's not so much that I stopped being her friend because she doesn't think the same way I do - let's face it, I (an agnostic liberal bisexual) spent my high school years in a small, conservative farm town; no one agreed with me. [Think of me as Kevin Bacon in
Footloose] Our falling out happened more because of the fact that at every moment, she felt the need to rub
her beliefs,
her religion, and
her opinion into my face. We couldn't go a single moment without her telling me how my lifestyle was wrong and how if I only believed in her god, I would be a better person. Eventually, I grew tired of being told I was wrong, and I became weary of trying to get her to open her mind up to possibilities, so I said goodbye. And that was a 14-year-long friendship.
I value my friends, and unless they do something to really piss me off, I don't just dump them. You're free to disagree with me, just don't rub it in my face every three seconds.
That being said, I do tend to hang out less with people who have varying opinions than mine. But I think that's just human nature - you know, "birds of a feather..."