I'd say you appear to be already over the idea of love and are more concerned with practical aspects of your current and future life.
That leaves us with the institution of marriage.
You invoke the practical concerns of trust, raising children, being able to laugh with someone, most of which are not tied to marriage and/or monogamy. Let me ask you,
- If your government and/or your lawyer and your friends provide you enough "trust net" that you don't need to rely on trust of a marriage partner.
- If you can have children through surrogate pregnancy, or if you are a woman, you wish to raise your child as a single mother (not to mention, the incoming future of genetically modified babies, so much so that after you've optimized your baby's features, there's hardly anything left in the DNA that relates to the parent).
- If you can laugh with a good number of friends. Maybe one or two of those friends live next door so there's no chance of loneliness. Not to mention social media, entertainment industry, the list goes on.
Do you really think the concept of marriage and monogamy remains as valid as it has been through history?
The validity of a lot of what I'm saying is tied to, not in any arbitrary time in history, but the current state of technology and human progress we're witnessing right in front of our eyes. I mentioned genetically-modified-babies. Forget about that. I'm a big believer of medical progress and the need for healthful longevity. If, in the next few decades, a person is able to live the life of a healthy 25 year old for 200 or 300 years, would that person be even interested in having children? If artificial intelligence can take care of 90% of your trust, and entertainment needs, would you even feel unsafe? lonely?
I believe we're headed towards drastic sociocultural change and the thinking of current populace, no matter how educated, is lagging behind substantially.
The idea of marriage/monogamy/love is getting more and more optional. Not to say people will reject it outright. You have the right to choose love and marriage and monogamy. But it's becoming more of a choice than a practical necessity.