I just threatened my wife, and I don't know why. Help.

Hate to throw this in, but do you think she might well be having an affair?

Sounds like the phone bill was an "excuse" to exorcise anger or frustration. Sounds like me at the end of my marriage.
My ex husband and I divorced in 1990. I wanted to leave for a number of years before that, and it finally plateaued out in 1990. I remember how trapped I felt for a couple of years leading to the finale. Then, I met 'the love of my life' and whilst that never eventuated, I knew at that moment, that I truly HAD TO END what was a lie.

Just something to think about.

God...I've just realised that this thread is more than 2 years old. Crap....