I don't get it???

Not sure if this is the right area but ok. Me and hubby have been ttc for 5 Mo now. When I get off my af he is always like 'it's gonna happen this month' and everything... but when my 'window' comes up its always 'I'm tired' or 'later'... to the point it's only once or twice in the entire 5-6 day window... it's like pulling teeth even for that... what should I make of this?