He started sliding his hand from my arm to my waist, he tried to place it on my stomach but then moved it back to my arms. Why would he do that?

So my boyfriend (this is his first relationship) and I, we were hanging out and I went in for a hug and sat on his lap. I was facing the front and he started sliding his hand down my left arm and placed it on my waist, he tried wrapping his arms around my stomach but then just placed it on my hands. I'm so confused what happened, did he not like me sitting on him or what?

He started sliding his hand from my arm to my waist, he tried to place it on my stomach but then moved it back to my arms. Why would he do that?
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