Unfriended for no reason?

[beargojbitty]

I was just looking at my Facebook and noticed a high school friend of mine, who married a fellow high school alum had a picture up and the only reason I saw it was because she had tagged her husband, who I'm friends with. So I look on her page and it says, "add friend", as if we were never friends, but we have been for years!! What's worse is that she's still friends with tons of mutual friends. It almost makes me cry!! I don't post anything offensive, we may have different political views and we weren't super close in high school, but other than that I have no idea why she took me off her friend list, and it would be nervy to ask her. What gives?