If the promotion was for a manager role, it might simply be because "you get walked over by people". Good developers rarely make managers unfortunately. While

If the promotion was for a manager role, it might simply be because "you get walked over by people". Good developers rarely make managers unfortunately. While I don't have much info, it could simply be that your manager doesn't think you're fit or ready for a managerial position. And btw, there's nothing wrong with that.