I wouldn't say you've messed up at all!
Sean's eating habits have got a lot better in recent times but my God we had some right nightmares at times, I once put him back on formula milk because he refused to eat anything!
He's better now, he'll eat quite a bit most days but then there are still days when he doesn't want anything (but I suppose we're all the same, we don't always feel like eating)
Hope he starts to eat properly soon
its horrible when they don't eat
xxx