Slowrolling

So I was at a friendly home game i play at 2x a week yesterday, and I encountered someone slowrolling... accidentally. Anyways, it was a 4 heart board by the time the river was dealt so you only needed one heart to make the flush, and one guy shows trips.... as he shows he asks, "Do you have the flush" he responds "no" I was busted by now and he had been showing me his cards when he got em and I knew he had the flush... he had QJ offsuit diamond/heart. So when he said this i told him to flip his cards, because he did indeed have the flush. Guy with trips got really angry bla bla bla and left pissed. We found out a hand or 2 later that he had taken his glasses off and he said he didnt intentionally do it. What made me mad was the guy with trips inquired to me "Don't I get the pot?" And actually thought because he said he didnt have the flush that he doesnt get the pot, he wasnted the guy with the flush's hand declared dead even though it was nowhere near the muck. WWYD?