Dito to everything that's been said. Way too much drama here. Sounds like they have issues as a couple and that spills over into their other relationships.
We had a couple do this to us. We played a couple of times and had set up another night for them to come to our house. He ended up having to work and she was suppose to call and let us know. Well when they didn't show up we called and found out she forgot to call us. She said he would be so mad at her because she basically caused them to stand us up. Apparently she has a problem with that kind of stuff.
I'm sorry it is just rude not to keep your committments or to call and explain why you can't. I would back away from them and move on to someone else, doesn't sound like it is worth your time.
Mrs Spoomonkey