My boyfriend promised to come over and visit me tonight, but he never showed up? :/?

I'm not usually this fustrated over such a little thing like this but because he lied about it and he can never plan things right i'm kind of peeved right now. So apparently he's "sick" and he can't come over, then a few hours later he rang me up saying he was coming over, that he's %100 sure that he's feeling better and will call me when he is on his way, anyways, I signed on to my FB and he was online he went offline straight away, my friend posted on his wall that he was going to see him tonight with a bunch of his other friends to hang out/chill out, I never thought anything bad about this but i'm angry because he never called me to tell me that he changed plans and i HATE it when things are last second, can someone please why some men are like this? arrrghh.. ;;