I can't stop dating multiple people at the same time
Oh boy How do you manage this?
I've dated more than six people simultaneously, I want to forget each partner as fast as it came
You are not a good partner at all, a relationship should be focusing on two people only. The way you fleet on shows you have lots of commitment issues and you can't keep drawing that as something else. You're just hurting all your relationships this way.
But I love all these girls and I don't even keep them secret. Each girl got to date as many guys as she wants.
People in a relationship expect to be exclusive. Most people are not ok with you dating multiple women. Are you sure you really love them and it isn't just lust?