Short and snappy, tries and quite lighthearted. 
DPs annual ball is free for him to attend (the company pays)
If I go with him, it costs £25 for my seat/dinner.
The arranged rate with the hotel is £100 - so £50 each.
DP is insisting I pay for my meal, and my half of the hotel as he doesn't want to go alone.
I personally, am not all that fussed, but having been told that, not only do I have to pay to hold his hand, I'm paying MORE than him, to attend HIS do, I've decide that I won't bother.
I offered to go halves on my meal so it was an equal split, he wasn't interested.
He things I'm being a cow now, I think I'm being entirely reasonable. 

AIBU?