The boss sounds kind of fishy to me. Probably best to move on though.
I thought you said you had support from your boyfriend on this and that could be a really good thing.
The only other thing I could add is that, as long as you can stick to recovery, this will just seem like a weird episode in your life in the future.
We all mess up. If you can use this as a turning point you'll be doing a lot better than I did with a lot of the weird things I did under the influence.