All mine

I belong to myself, I am my own and I have the right and the responsibility for my life and my body and my actions.

Monogamy is hard for me to understand. Why is romantic love seen as something measurable and finite that can only be given to one person, while all other kinds of love are viewed so differently?

If I belong only to myself then the physical and romantic attention that I pay to someone else is mine to give and should be perceived as a gift, not something that can be expected or demanded. Not something that can only be given to one person. How can it be special and meaningful if it's expected? If I was to "belong" to someone else, then how is the love I give to that person worth anything? If I belong to someone else then I'm an object to be used. If I belong to myself then my affection is something I can give because I choose to. It should be equally valuable whether I give it to one person exclusively or to several people.

Having romantic emotions for one person does not mean that I can't have romantic emotions for another. I don't work that way. There isn't a simple scale of romantic emotion, friendly love, affection for family members, the end. I love everyone differently. I have different feelings for everyone. I love all of my siblings but they're different people so my love for each one of them is different from the love I have for the others. I love my friends, some of them I'm also attracted to, others I adore, others I just want to hang out with all the time, others I can talk to about anything, others I can pick up a conversation with after months out of touch.

I love my lovers differently. 

I'm in love with people in different ways. Sometimes at the same time.