Two years difference is probably less important, especially if a woman is popular and sure of herself. I see them being the couple where Frances was the quieter one. With her job, her three kids and her community activity, she probably satisfied her need for social interactions outside of the house. I suspect that their house was rather quiet and solitary. RC, on the opposite end, was gregarious and, JMO, would prefer to have more guests, parties, friends coming in. He also appears like a very high-energy person, somewhat exhausting, if I could make a guess. I wonder if it was not only his love of women but his overall high extraversion that fueled these trips. Francis might be tired of him constantly being in-your-face and feeling relaxed when he'd leave - even before true problems would start.
Nothing of it seems to be indicative of a murder or even DV, of course. Simply, while Frances was self-reliant and self-sufficient and probably, the type of a person who, when bored, would easily find a new hobby, her husband seemingly needed the whole world to constantly validate his existence. JMO, MOO, of course.
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