Should I give in a deduct money from what he is to pay me?

I recently sold an item for $600.  This item was mine to do with what I wanted.  My stbx offered to help me buy a new bedroom suite, since the one from our house was to big to fit into my small apartment.  Now he wants to deduct this amount from my monthly support of $1400.00.  When I made a comment about that wasn't the deal, he says that he should have listened to what everybody else has been telling him all along, and that he is done with me once and for all.  I dumb founded, I don't know what else to say.  I've have been most accomodating to him.  He wanted this divorce.  I'm tryint to move on.  Am I wrong in this thought? 

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