Here is my thoughts on relationship:
people are attracted to each other for: body, soul, mind, money or sexually. Now Brogan’s body (and looks in general) are not something the majority of the population would find attractive but again maybe Ben does. Soul - again not something the general population would fall in love with, but even people on Death Row find love. Money - nope, and given that Ben works away the sex life is also not what is keeping him there. The most tragic for me is that her mind is also so unattractive. She is not smart, clever, funny, she is not quirky or creative, she is not a great conversationalist. So you need to find at least one of these attractive in your partner in order to have a happy relationship.
So why are these two together? Again I think there is something suspicious about Ben. Given that they don’t have kids or are legally married, there is literally no reason to stay with someone just to say you have a girlfriend, unless you are hiding behind it.