Loving and being loved does not give you the right to control another adult. Love should help the other person be the best person possible. It should not make decisions for the loved one, or expect obedience from the loved one.
Too many men think that women are their possessions.
For instance, this idea that you can not date a woman who once dated your friend without that friend's permission is DUMB. THE ONLY person you need permission from is the woman you want to date.
Of course, you should also NOT flirt with another person who is ALREADY in a relationship. But once the relationship ends, each person should be free to have a relationship with ANY other person. Dating someone does not give you endless control over the person you are dating.
It is not romantic to chase after a person who keeps saying, "No". It is stalking.
The culture of "stay away from MY woman" seems romantic. Actually, it is a statement meaning, "I get to control access to an adult person because I am unable to trust the adult person."
Men of my generation were sometimes confused when their women left them. I always understood why the women left. They left because poverty is better than enslavement.
I enjoyed my marriages. I try not to focus on the end of the relationship, but on the good times. Loving and being loved is a wonderful experience. Keep loving fresh by giving rather than taking.
Happy Valentine's Day!