We don't know. We know he seemed to be uninterested in sexual relationships or maybe he was suffering from Long term PTSD.
He was a virgin at 26 (not uncommon for someone born in 1888), with no evidence of ever having a sexual relationship. He proposed to a woman at the age of 21 who turned him down.
He is straight
Daniel Lawrence Whitney, also known as Larry the Cable Guy is straight.
No dude she have a boyfriend
The character of Flapjack is not written with sexual orientation
Nothing is known of her sexual orientation.
The Joker's sexual orientation is not written into his character.
Soko's sexual orientation is heterosexual/straight.
The fictional character of Yoshi is not depicted with sexual orientation.
The sexual orientation of David Rodriguez is unknown.
Matt Evers' sexual orientation is not known.
The SNL character "Gilly" was not written with sexual orientation.
Frankie Muniz has not stated his sexual orientation.