The thing about marriage is that anybody can do it. You don’t have to love somebody to marry them. It isn’t special. There’s no test you have to take together or qualifications you have to meet.
So yeah - he’s angry, and lonely, and he’s also married, but none of those things are related to each other.
Sounds like he needs therapy, but in our society men aren’t encouraged to share emotions if it doesn’t perpetuate an image of strength. So he’s expressing his emotions in a “socially acceptable” way: anger. Which is probably what also got him into these backwards ideas about his political ideology as well.