Maybe your man is just stressed and burnt out from work/ life/. I know when I had babies, and I was hardly sleeping but still running around all day, I was exhausted, irritated, and overwhelmed for a couple of years. I know this is common for mums with young kids, and sex was the last thing I was interested in then. Just to have a few hours undisturbed sleep was all I wanted. So maybe your man just needs some rest and work/ life balance.