Awww know how you feel Ruby, so annoying!!
I have an old college friend, who is a bit of a lad, where as I am all settled down (infact I was when we met at college) We meet up a couple of times a year for a drink. The thing is he tends to go on about the house he has bought with all the money he earns and how he has been working on all these important jobs etc, he can be very arrogant, then I watch him stifle laughs when I say about my job at school and how we can't afford to even go on holiday. Thing is he has told me in one of his drunken moments that he only ever wanted what I have as he has no-one and all girls basically use him for his money, but then if you listen to him it's all his way and the woman has to fall into his plans or she can get stuffed!
Anyway I text himt to say sorry I couldn't meet up with him and heard nothing. So I emailed him and I got a really rude reply saying yeah forgot to text you back, going away with so and so that weekend so wouldn't have been able to make it anyway. I felt like sending a rude reply back but have refrained myself and shall be busy the next time he calls!! He didn't even say hi or bye or sorry.
Manners cost nothing as you so rightly said!