Is he scared and trying to keep me at arms length, or really dislikes me?

My work partner and I both have extreme trust issues for different reasons. With everything he has been through, I don't know how he's functioning at all honestly. We're on good terms, and I think we mutually enjoy working together. We're always laughing and joking. He doesn't make really and effort to hang out outside of work, but we've been becoming increasingly closer. We've done it before and he's invited me, but in groups. We understand each other a LOT, as in I've never quite connected with someone that well. When we first got partnered together though, when I was talking, he'd give me his 100% attention. Eye contact, all of it. Now we have deep conversations still, full of all the eye contact, but only when he's the one talking. Am I just not important to him? Is he just that arrogant? Or is it just that he's still trying to keep me at arms length? Every time we have a moment, it's like he catches himself and puts a stop to it.
Is he scared and trying to keep me at arms length, or really dislikes me?
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