Upload it somewhere for safe keeping, better yet - have 2 copies and tell about this recording to a friend (but without details if you don't want your friends to tell their friends - just that it's important and it's on such and such server). You have him by the balls. If he ever tries to force you (but not before that), tell him that you have a recording of him and police will find it... That should keep him straight.
That is if you don't want to kick him out before that, which you probably should.
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