What should I do about this 'Friend'?

In our friend group there is this one guy, we will call him Sam. Now Sam is sometimes a, for a lack for a better term, an asshole. He will tell my I'm a screw up and useless. But then he'll be completely different, espically if its just us and he'll be incredibly kind. Usually when he's kind in his kinder state he'll either give me something or do something that in my eyes is incredible (an example he bought a movie I had never seen but wanted to watch for around $15 instead of renting it for $3 so we could watch it together even though he had already seen it and had other things to do.) I don't know what to do about Sam honestly and not knowing if he hates me or not makes it a lot harder
What should I do about this 'Friend'?
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