People are not objects. Your apparent lack of respect for others saddens my heart. You think your life is getting better just because of a little (or a lot) of sex?(no need to answer) Abusing yourself is one thing, but, when you go off abusing other people that is when you cross a line that shouldn't be crossed. I don't know how you feel or what you think, and never will, what matters is you know that it is not okay to use people. I don't know for sure if this is what you are doing (your details are sketchy), but, if it is, STOP IT.
It is true over the years the morality of humanity has degraded, and sex has overwhelmingly become something to be cheered and bragged about (of course for some this was always the case). Regardless of how our society puts sexual gratification before everyone else, we as thinking and conscious people should put one thing before the desires of our bodies: respect for others and for ourselves. You have been hurt, you have been cheated on, you have suffered your own version of Hell: whatever you do, don't go inflicting that Hell, or another version of it, on anyone else. That will only destroy you more in the end.
You may or may not be one of those that enjoys manipulating others...or you may just be someone who has had so much pain they have lost site of the value of goodness. I know you will disagree (or cry foul) with all I say, of course, how else would you be able to deal with yourself and your impulses? Well it's time to realize that just becuase it feels good physically, does not make it inherently good for you or others. Just because it helps you forget your own personal Hell for a short time, doesn't make it right (nor a lasting solution). And just because you have fooled yourself into believing that treating women as sexual objects is right, does not make that a truth.
Don't give up on yourself. I think the devaluation of others can only happen after we have devalued ourselves. You do have great worth, this is truth. You are not beyond true happiness or self forgivness. You just have to stop and think a little, open your eyes inward and ponder. Know that there is a part of you that wants something more than casual sex (or even sex in general). Yes, there is. That is what makes you a man and not just any other animal, that is what gives our species a chance to survive for a very long time to come. We can think outside of our immediate desires.
I do not believe you to be a bad person, only one who is a little lost. I hope you did not put a brick wall between your mind and what I have said. If you don't want to believe that casual sex is wrong, that is fine, but, if you take anything away from this, please do take away the knowledge that it is not okay to use people, no matter how much they may want to be used at the time, or how much pain you yourself are in. Finally remember, forgive yourself (and we all have need of this), or you will never heal yourself and get further past your inner anger and torment.
Lastly, I apologize if I drew some wrong conclusions from what you posted, but, when you call someone your "slave" I can't tell how you are meaning it, and so I take it near-literal, for the sake of this woman and you. Believe me, I don't enjoy getting so high-minded (I'm far from perfect), even I make myself nauseous sometimes, that doesn't make my words meaningless however. Anyways, good luck, I wish you well, and for your life to get truly better, and it can. It is, afterall, up to you.