Perhaps. It's very possible he simply never got over the death (perhaps suicide) of his fiancé, Ann Coleman. Years later as he was moving up in politics different women wanted to take him to the altar. His reply was almost always: "Marry I can not, for my affections were buried in the grave.”
Or was it “...for my affectations were buried in the grave.”
Quick, a blue (and red and green and yellow and purple) ribbon congressional commission to investigate. Table everything else.
The accusation that Buchanan was gay comes from a gay historian who interpreted an affectionate letter to a friend as evidence he was gay.
There’s no proof whatsoever, but it has stuck.