What is the worst reason you've ended a relationship on?

I'm curious to hear about breakup stories and is it always "its not you it's me" as an excuse, but really what is the worst reasons you've had for a relationship failing and breaking up.

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A friend of mine, a guy I know, him & his girlfriend of 5 years brokeup over money, it wasn't about sex at all, infact he said it was about running up too much of a debt on rent and lack of money, so they split up at the worst possible time, the day before Christmas, how shitty is that.

I dont have any stories myself yet but I will post it when it does happen.
What is the worst reason you've ended a relationship on?
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