My Boyfriend Is A 68 Years Old Veteran W History

my boyfriend is a 68 years old veteran w history of substance abuse,in the last few years he has been saying that he can hear me vispering w another person .this person seems to be here a lot according to him,he wont belive me when i assure him i am not talking to anxone and that infact nobody is here,he does not act strange regarding anything else but this one things ,i might haxe to move any idea