Do skinny guys prefer curvy or skinny females?

My boyfriend is 6"1' and 150 pounds, so he's very lean. He's got some muscles so he's not stick thin though.

I'm 5"7' and my weight is 123 pounds at its lowest. It went up to 128 after a few outdoorsy weekends spent eating junk. every time I gain a few pounds, I feel fat and worry that my bf's not gonna like how my body is turning out. My instinct tells me that being a man and being as thin as he is, he must prefer some curve. At the same time, I don't feel very comfortable when I gain a little weight even though I remain below 130 pounds :(
Do skinny guys prefer curvy or skinny females?
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