People are trying to say there's no magic wand to change your husband - you need to enforce the change - and doing a bit more than spending time alone is a start.
Dinner conversation (if you ate together):
Him: so how was your day
You: I read a book but couldn't concentrate
Him: oh...
Of course a class won't change your bloody husband but until you also change things you won't feel any better even if he does show some interest! No one is saying one class will have miraculous powers, but ITS A START. Small steps.
Inferring anyone who isn't teetotal is a gin swilling alchy is bloody rude op. One person made a joke and you keep digging at it.
Maybe those of us suggesting things have been where you are now and we're out the other side.
YABU calling your husband boring, because you seem unwilling to even consider doing things to reignite the interest he had in you.
And you've still not said a lot about your DCs other than they prevent you going out. How old are they?
When me and DH went thru a couple of years of this I joined a church - got me out of the house, very welcoming people, other kids for the kids, and that's not even taking into account anything around faith that helped.
Maybe call your thread 'can I vent about my boring life and not want to fix it'