What's your definition of faithful? My mother confessed her love for some other guy when I was a toddler, got rejected and felt bad about it so she told my dad everything and he stayed with her despite her abusing him over the years. She was still super angry about all that crap for years after being rejected. My dad had to have his employees pick us up and drop us off at school sometimes because she didn't want to. He stayed with her because he was traumatized from what happened to him after his own parents divorced. You could say she even abused this trauma in a way. Now while she didn't technically 'cheat' or do anything sexually related with any other men, she still admit to my dad how she fell for some other guy over him. Would that be considered cheating under your definition?
Like the others have said, there is much more than meets the eye. What you see at face value is just what they'll allow you to see. I consider this to be cheating myself because it shows that you are on the lookout for other men despite the you having a family. My parents always said how we shouldn't want to ever live in a broken home. But quite frankly, broken homes are a lot better than dysfunctional ones a lot of times.
We don't know the situation with the girlfriend's parents.
Men don't just up and spend that kind of money unless they believe they have good reason or they desire to do it and they have that kind of discretionary income. For all we know the dad is a philanderer and appreciates the mom's loyalty through his cheating. We have no idea, and honestly it doesn't matter.
OP has no idea as well. I know a number of long term happily marrieds who have been together for 20-50+ years. A gift like this in such a context is not usual and is a discretionary gift. I've seen people give jewelry, expensive cars, second homes, dream vacations...
My brother-in-law for example bought my sister a 2 million dollar home recently and took her to Tahiti for 2 weeks for their 20th anniversary last year. She's a great mom & she worked 3 jobs for years to support their family when they were just starting out and he was finishing his education. She was a D1 college cheerleader at a major state school. She is frugal frugal frugal and never wears make up or jewelry other than a simple wedding band and a family diamond (she only wears the diamond on special occasions.) She never drank alcohol, never partied & was the essence of a good girl. They met in a class and their first date was a study date. He wanted his shiny red Porche a couple of years ago & she said "Of course dear you've worked very hard to get where you are." The car cost 70K.
They will retire millionaires because they have worked as a team over the years and been financially wise. He's the only man she has slept with. They were college sweethearts.
My sister embodies Proverbs 31.
That's a good definition of faithful in my book.
I know quite a few couples like this.
The fact that his girlfriend is saying "no I don't expect that...I only want you" actually suggests to me this might be what her parents modeled...which is a great example guys. That's how my sister was (and still is).