Why do you care what he accuses you of, you know the truth. 13 days does not make for recovery, it is a mere drop in the bucket....
A boundry is set to protect you from abuse, from heartache, it is about what is and what is not acceptable to you.
Clearly put, if my ex-abf got on his nasty dirty horse, I left, closed the door and disappeared, until I was ready to come back. He didn't learn, so I tossed him out...poof, he was gone, he crossed my lines.
Your hubby is sending you a message, he is not happy, in recovery or out of it.
To me, the only thing you need to understand is that he has a problem, that he created, you didn't, don't try and bear his burden for him...it is his problem, not yours.
Have you gone to any meetings? They were and are my life raft.
Keep posting, it will help.