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Hi and welcome to JA. Ray here to help you today.Please bear with me a few moments while I review your question and respond.
It is possible your ex could argue cohabitation if he is spending nights there.You have to be careful, male judges are notorious for penalizing you for this, I would consider having the boy friend leave even if is late .He has a separate address , thats some protection but again there is risk here.It can also work against you custody wise if the kids are present.You have a pretty good financial stake and there is risk if he is spending the night that a judge says thats cohabitation in Tennessee.
Case law here--if you look at it you should be protected under the law from overnights counting but the judge would have alot of discretion..