He's in a no-win situation with whatever his response is to that isn't he...
If he says you're not too fat, you're lovely etc, then he knows that will be giving you hope that there is a chance with him for the future.
If he says yes you are too fat then that will be utterly devastating and obviously very untrue as it's clear he is attracted to you...
I'm guilty of those questions all the time... where H cannot say anything because whatever he says will be wrong!
Can you send a quick follow-up e-mail and say just joking, glad we've got all that sorted and glad to have you as a friend... or something along those lines... You don't want to leave things like that do you...?