From your description it is clear that you both are very much involved in each other. So Try to convince your bf that your dedication lies towards him and him only and that talking with other guys or having a fb account or wearing fancy clothes will not change this.
But while trying to talk with him about this make sure he is in good mood and try to be nicest while convincing and tell him that there are some situations where it becomes essential to talk to guys and that without his permission you feel guilty. Also if he allows you to be yourself you can be much more happy than present.
Be calm and handle the situation. Don’t create issue if something goes wrong during conversation. Take time and continue.
Hope you will be happy and he can understand you. Hope for the best. Chears.