['A good friend of mine organized an unexpected birthday celebration for me, it was very sweet of her to do that for me.', 'You must be a very special person to her. Is she single?', 'She is actually in a long term relationship. She is a considerate person though, which is cool.']
Too bad, oh well, if things turn around in her status, you have someone in her that you can consider
A friend of mine organized an impromptu celebration for my birthday. It was very considerate of her to do that.