Am I being taken advantage of?

so this guy im into, he asks me to buy a lot of things for him or borrow, mostly borrow. So far I let him borrow over $300 worth of things. Items I own, my netflix account, food, etc. He has his own money, two jobs, nice car and a place to stay. He has yet done anything for me except let me stay over at his house but we had sex that night.
I hate bringing up how im always doing stuff for him because he goes into attack mode and brings up how he has two jobs and can basically buy everything im lending him. We got into fight over something i let him borrow, he gave it back and told me someone let else let borrow theirs but shortly after he goes back to asking for mine back because the ones he has isn't good enough. I said no and he threaten to stop talking to me. This time he wanted me to do two things from him, buy him food and buy something for his house,. He says this time he'll give me the money but im sure it will turn into me paying for it.

Am I being taken advantage of?
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