Though you're not wrong, the overall picture is much more varied and colorful, but also simpler. Life. Sex. Contractual plans and the overlap of all of these with culture(too often too narrow) and competition as merit. The belief in The One Romantic pairing (a commercialized 2nd Christmas for couples) is a construct that we use to pretend we can't be in love with all of the people we meet (or they, us). Too much of the rest is bleedthrough of competitive dumbassery that saturated our lives to keep people from thinking collectively and openly about navigating life fluidly.

I've been both sides, and frankly, the guilt/blame meme is as much bullshit as is the religious belief in consumerism. You either respect and want the contract to succeed for future needs/dreams or you don't. All laws and contracts should come with an expiration date. Especially marriages. Renew as desired.