What does a hand on the shoulder mean?

I work with this guy who I find attractive and might like. We have known each other for 1-2 weeks. We hold good conversation, he has complimented me (only my hair though), and is overall just really nice. A few days ago he touched my shoulder a few times and it kind of confused me but I have a feeling I'm overthinking this. He would come up behind me while I was doing some things at work and I would feel his hand on my shoulder. It would linger there for about 4 seconds before he'd move on. He wouldn't say anything and I didn't know how to react. I'm attracted to him so I didn't pull away. I'm very sensitive to touch, so maybe I'm reading too much into this.
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What does a hand on the shoulder mean?
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