Yes, I can see that from what you have described.
Well, he may be receiving a mixed message here. I wouldn't be going anywhere he is, like the party for instance. You also told him you were leaving, no need to check in with him since you are no longer in a relationship (I assume you have already told him that clearly).
Just distance yourself. No need for chit-chat around the house, checking in or conversations that lead him to scream at you. Go about your life.
As for the lease, well you could try just leaving him with it. Have you actually discussed that with him at all?