Questions: Flirting

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 though so maybe I'm reading too much into this.

There's a guy that I've been classmate with for about two semesters. Since I first saw him I've had a crush on him, we have flirted, we've had lots of eye contact and we've had some physical contact as well. The thing is that we've never gotten into a deep conversation because we are always surrounded by other people. The few times we have, he has shared very private/personal information... and several times he has stated that he shares that info with me because I'm not like the rest/everyone. The thing is that I'm not too sure why he might do this, is he been friendly? is he interested?