@45am polyamoury is absolutely love too, that is correct. But you are missing the vital fact that
a: toxic love is still love
b: toxic love is still toxic, and it's horrible. Love can be a horrible, horrible thing, twisting away at your guts like a rat chewing away within.
You say that someone in love won't hurt their partners? Let's set aside a love that might make someone spurned turn someone into a monster, a love that should someone catch their love in the midst of adultery turn murderous.
What of the self destructive love, that harms yourself or people other than your love?
What of the love that would make you wish to give your love everything - money, time, affection, draining you of more than you have? Regardless of whether they love you back or not? Is that love? Regardless if they even know you exist? Or would you call it something different? Spending money and wealth and livelihood on a gold-digger, or on a twitch livestreamer?
What of the love of someone battered by their abusive spouse, and yet going back again and again to be beaten more, without rationality? Are you going to say that person isn't in love, as harmful as it is to them? Would you belittle such abuse victims and say they aren't in love, and call them fools and entitled?
Not everyone in love wants to possess their partners. There are many kinds of love that are not toxic. Platonic relationships of respect. Couples in matrimony. Free love orgies.
And then there are some that start toxic, or become toxic.
It's ironic, you saying that I am romanticising love. You are saying any form of love which doesn't fit a perfect pure love isn't love. Isn't that itself romanticising the idea?