I keep on choking on the "platonic marriage" terminology.
Platonic love is a chaste but passionate love, based not on lack of interest but on spiritual transmutation of the sex force, opening up vast expanses of subtler enjoyments than sex. That is not what your hubby says you have.
To me, "Platonic Marriage" is an oxymoron. Maybe I'm old fashioned, but I'm still subscribing to the belief that one reason marriage exists is the legitimizing of of sexual relations.
I think what your H wanted to say, but couldn't, is that you have a "marriage of convenience". At least it's convenient for him.
Hairdog, in a hurry, but wanted to get that out (e.g. vent)