Why do YOU think your libido has waned? You said there are times you'd rather be doing laundry....are there other things running through your mind constantly, like lists of things you feel you need to get done? Has his behavior towards you changed in the last 5 years? More grabby? Attitude? Anything really.
I want to impress upon you that your rejection of your H is making him feel very unloved by you most likely. Sex isn't always just about sex and physical release, for both men and women it's about much more emotionally....it's about how our spouses perceive us, how they react to us and only us....and something we share as a committed couple.
Are you aware of the emotional impact you are having on him? You state that at this point you wouldn't care if he was having an EA (do you really mean an emotional affair or PA (physical affair)? Either is truly devastating to a marriage...and I don't think you truly realize the impact it would have on your if that happened. It's easy to think "well at least he'd be leaving me alone.", it's a completely different issue to live with infidelity.
Telling your H to go find someone else to have sex with is such a rejection of him...in so many ways. Would you consider counseling? I have a sneaky suspicion that there are underlying issues (that perhaps you aren't even aware of at this point) that could be affecting your interaction with your H...since you seem to be physically healthy otherwise :-)
Something I want you to remember, if you don't take anything else away from this RJ is this....it's not that your H just wants "sex", he wants sex with YOU, his wife...the woman he committed to....not with someone else.
Oh BTW...welcome to the BB You will receive great input from other really supportive people on here....this is a great community!