Help me understand why my boyfriend think he owns my body?

I can't understand why he thinks he owns my body. He likes my body and compliments me often. After we had sex he pretty much claim that "He own all of this" When I get dressed or when we are lounging around he will look at my body almost like a 10 point inspection. He then rubs me on my boobs or butt...when I say stop he says "this is all mine". Another example he was touching my breast and says these are going to be filled up with milks soon. WTF?

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