I'm guessing your BF is angry with you because he cares about you and is worried. You say he is just "figuring" this out. Have you actually had the conversation with him and confessed to him that you have a problem and are recovering or is he just guessing and inferring?
Re-read the last 3 sentences of your 2nd paragraph. That is a conversation I might suggest you have with him. Apologize for Friday. Let him know you are struggling but that he means so much to you. Tell him about the guilt and shame you feel and see if he is willing to help you get through this.
It would be so much easier for you to recover with a strong support system, however keep in mind that ultimately your recovery the most important thing for you to focus on right now. Whatever your recovery program is, throw yourself into it 100%.
You can do this!