... .it's no fault of his (he was drunk, and he is generally a troubled guy), but why he would do it - and why do I feel so cheated? After all, everything is okay, money is not lost... .but I feel physically very stressed out.
I think you may have answered your own question. He is a troubled guy. He will do things that don't make sense to you. He is looking for your reaction.
I'm currently working through the
Feeling Good Handbook by Dr. David Burns. It's helping me understand why I've been carrying negative feelings around like an albatross. It may help to take a look at why you are feeling as you are about a situation over which you have no control.