Because you need to work through the emotions and the are new to you. Take your time. Be kind to yourself. And don't feel stupid for something someone did to you. You called and wished him well. There is nothing wrong with that. He got off the phone to party. There is something wrong with that. So who should feel badly? Pick up where you left off. You don't have to let someone's else's behaviors effect your outlook. You are doing a great job taking care of you. Talk about it in a group meeting. I bet you aren't the only one to fall off the wagon.
Jenny