I'm not really fat, so I'd just assume he was checking out some website. If I was fat, I'd look into the site more and see what it was all about. Depending upon the results, I'd either rule it out as just some random site, or I'd ask him if he thought I was fat. If he said "no I don't think you're fat" I'd ask "then why are you looking at myfatspouse.org?" then if he answered poorly I'd tear his balls off, but if he answered well I'd kiss him and let it go.