Ferdinand was unfaithful pretty continuously during his marriage. Probably for two reasons: first, he was highly sexual and didn't have a family history of prohibitions on adultery. Second, Missie was highly NONsexual and after a few years, really resisted sex with him. She was one of those people who tended to like the romance of love, but not the physical side. My understanding of F was that he liked the physical side, but wasn't even aware that there could be much of a romantic side!