Are my friends really just users?

My husband and are friends with another couple who we see quite regularly and enjoy their company as we always have a good laugh etc however its not so simple unfortunately and here is why.
Once about a year ago we decided to get together and share some takeaway food. We purchased the food and intended to receive their half of the money it cost when they arrived. After eating the food they announced "oh gee sorry we didnt bring enough cash can we pay you later or get the food next time".
My husband and I are not penny pinchers at all and both thought ok thats fine no problem but it did pass through my mind for some reason that we would never see the money again. Perhaps its my lack of faith in people I dont know. Needless to say we never did see the money again nor did they return the favour or mention it ever again.
One year on we go get another takeaway meal and they do the exact same thing again. I didnt show it at the time but I was furious for quite some time. My husband told me that I was over reacting. I actually still feel angry about it now just thinking about it. This was over 2 months ago and again they have not mentioned it nor returned the favour.
I feel used.
There is no way Im going to let this happen a third time. I actually feel like severing the friendship because of it. I believe that if someone is a true friend they would go out of their way to make sure they did not forget.
What would you do in this situation?