Sounds a bit like, "Married couples stay together because they made marital vows and that's just what they're supposed to do." Almost like, "We're doing our civic duty to keep America strong." Social conditioning is easy to underestimate, so it's possible that's indeed where he (and his wife) are coming from.
Glad it's not having a bad effect on your relationship with him.
Love means never having to say, "Put down that meat cleaver!"