You cannot control that you will love someone forever, so you cannot promise that. What you can promise someone is that you plan on spending the rest of your life with them and that you have so much love that you trust it will last forever. Sometimes that does not work out. That is no one's fault and no one owes to anyone to stay together with a person they no longer love.
And it has been one of the greatest mistakes humanity has ever made. If there is a good reason, sure, you cannot be expected to live with someone who has been cruel or irresponsible towards you. But no-fault divorce just because you got bored? Fuck off, you made a commitment at the time. Relationships do take work, always have and always will. Especially when there are children a no-fault divorce is pure selfishness.
With that said, we only know one side of this story, so I'm not going to argue for either side in this particular case. I'm talking in general here.
Does fault only include cheating? Can the fault be on the same one who initiated the divorce? What if the fault is simply someone has changed so much that they're no longer compatible with person they fell in love with before? The fault could be on oneself without any inkling of infidelity.
Til death do us part has been ironically dead for decades now since people have been divorcing at high rates for long enough that it doesn't really mean much anymore, and that's okay. Things change.
No, it's a legal term. From wikipedia:
>No-fault divorce is the dissolution of a marriage that does not require a showing of wrongdoing by either party.[1][2] Laws providing for no-fault divorce allow a family court to grant a divorce in response to a petition by either party of the marriage without requiring the petitioner to provide evidence that the defendant has committed a breach of the marital contract.
It quite literally means that people can request divorce for any reason.
Humanity has a lot more variation than the our standard modern marriage.
Making marriage the norm would not fix any of the issues I see in my own society, and marriage causes other problems.
Many people I know (including solo mums) that I know would love to find someone worthwhile marrying... However they haven't (or can't) find someone worthwhile, so it is better to remain single than get married into a dangerous relationship.
I suspect you are mistaking cause and effect. Marriage isn't a cause, it is an outcome.
Yet, people routinely do in wedding vows. Maybe that tradition should end. Maybe the traditional wedding vows should be changed to "Hey, we'll give it a shot but no promises!"