The concept of romantic love is quite bullshit to be frank, it's not rational, realistic, healthy (for people or society), and so rigid in standards that even "succesful" relationships (when one of the people die) are dysfunctional and/or long declined satisfaction-wise unless someone died in first 3-5 years. People are also more miserable once they have kids.
Telling yourself that another person is "yours and no one else can 'have' them" is going to cause a lot of problems, and the only reason this structure has lasted so long is because women were/are (in certain regions) treated as dairy cows. Most of this comes from christianity, and the global genocide of indigenous cultures around the world, which often were centuries older.
Notice that when women recieve more education, fertility rates decline massively, marriage rates drop, occur later in life, and divorce rates increase. Why is that?
I'm no feminist, marriage is to a less extreme extent terrible for men too. And the dysfunction in this social dynamic, among other things, creates things like rape, prostitution, domestic violence, child abuse/neglect/trauma, psychiatric conditions, and so on. Don't even get me started on hyper-sexualization, dating, or whatever you call what's been trending for the last 3-4 decades.
Anyone defending or supporting the cultural notion of romantic love is ignorant, lying, and/or making money off of it. Then the population argue about it instead of solving real issues.
No I don't advocate polygamy, Saudi Arabia is not any better. People aren't property whether their child-parent, man-woman, or whatever else.