I see them, during the 'working' years, as being a tightly knit pair with a friendship that is supportive, perhaps even primary compared to anything else they might encounter. I tend to embrace the Return Movie, have written several stories based on it in fact. I see attempts at romance and long term relationships, although they do not seem ideally suited to them in my estimation.
The marriage scenario is one that wishes them well, while I tend to think failed relationships and solitude is more likely the state of things; it is what they were groomed for.