He consistently would refer to things I did as, "Wow, that just sounds like too much energy."
He definitely had a set schedule. I asked him to meet me for coffee on a Monday evening, and despite being single and having nothing else to do, he just said he doesn't do things during the week, that's not his schedule, even if on the weekends he'll stay up until 3am commonly. There were other things too that were similar (i.e., he had no LOGICAL reason to not do them, they just did not conform to his chosen schedule).
So that's what I noticed: He was a very sweet, very respectful, very considerate guy who also kept a fairly neat house and had things basically in their place... but he did not like to have things moved out of the place he had put them in. He had created his world and did not want it to be modified, although he wasn't rude about it.
I bet he'd be utterly faithful, utterly responsible, utterly kind. But he didn't really like risk, he didn't really like expending energy, and he didn't really like change. And he wasn't really happy about the last gf, who had decided she wanted someone more active; he was disparaging of her choices, although when he told me, I was thinking, "hmm, I can understand why she did that."