Hey,
I have posted i post like yours on a different forum. I asked what men's sex drives where like in general. I asked what made a difference, they some said work! I don't know if you have thought of this one, but now i've thought bout it it makes sense. We both work different shifts (i'm a nurse and he's a fitter). Make time 4 each other and talk to your girlfriend about it if you can.
Hope you manage to sort things out as i know they can cause i lot of tension and upset.
Good luck
