My best friend says she is 'rubbish at replying to messages' but whenever she is with me she texts her boyfriend pretty much constantly. I sent her a nice text on her birthday 2 days ago saying happy birthday, have a lovely day, let me know when you're free and I'll take you out for tea (at her favourite restaurant). I've had no reply but she's been posting on fb etc so has had her phone. Do I need to stop being sensitive? I just feel miffed she hasn't even bothered replying even with a quick thanks, I'd never read someone's text like that and ignore.