How can he "not let you out"? Is he threatening you? Physically stopping you? Is there a history to this, which means he can lay the law down, and you know not to rock the boat? All of these suggest an abusive relationship. Confide in your friend or a relative at the very least - preferably a domestic abuse support service. Your council office will have links to a local one. Your GP can help. Even your local pharmacist can help. If you are literally imprisoned or fear for your safety, absolutely ring the police. Are there children in the house? He's likely walked to the pub? Does the thought of him coming home drunk worry you?