there is a thought that goes ...
' women need to feel loved and wanted and cherished to have sex and men have to have sex to feel loved and wanted and cherished'
not sure i totally agree all the time, however the point is ...your DH isnt making you feel desired and loved and therefore you dont feel like sex and you not feeling like sex probably comes across to him that you dont love him or desire him anymore.
This is two peoples problem and what i am going to suggest goes against the principles of two people sorting it out together...but one of you has to take the initiative and frankly it is likely to be you.
Just do it...tonight....it doesnt have to be earth shattering...but just do it.
I am sure people will come on and give advice about rebuilding intimacy, giving massages, lighting candles, date nights etc etc but none worked for me when in similar situation...felt contrived and false and huge pressure.
Often having sex makes us want it more so by almost making yourself for a few times in next few weeks you may find re-stokes the fire so to speak .
I went through similar but in my case my exdh just decided we were having a celibate marriage , no discussion ...nothing ! It came on back of years of very very dwindling sex life and i remember the pressure of it...thinking ' oh i have really got to do it tonight and the longer it went on the harder it got.
So give it a go and if you dont 'make it ' after 'faking it' well you know you tried