Be very wary and watchful of his behavior. Don't let him get away with bad behavior, or let it slide if something happens, especially if it has to do with his hens- it could make for trouble.
That said, this possibly still may not necessarily be bad behavior...but stay watchful and prepared to deal with him anyway (just in case), as only time will tell.
We also have friendly roos who use their beak to gently pull on my pants leg to get my attention to occasionally be picked up or petted, or play with my jacket's large, heavy plastic zipper pulls. (They LOVE to pull the jacket pocket zippers down, I pull it up- etc., it's an interactive game we play every single day- they all love to do this.)
One roo (Nipper) will occasionally nip my hand if I don't pay attention to him fast enough (we have 85 chickens, 16 roos). However, he will squat like a hen in my arms with his head down and tail up, and will cluck contentedly when picked up, so I don't consider this as necessarily bad behavior, as he is showing me I am dominant. However, we are always watching to see if he otherwise acts badly, or if anyone else changes behavior other than minor pecking order squabbles with each other. So, just watch your boy, but be prepared to deal with him just in case.