Insight on actions?

I am a 27 year old woman,I am straight but open concept.
I have a fellow coworker that used to display quite a few signs of liking me,ie always parking by me even when plenty of spaces available,always staring/making eye contact etc.so I figured hey i'd send him a fb friend request.FB profile stated he was into woman and single.He didn't accept it so after a few weeks I figured cool,i'll just delete it.[yes he does go on regularly].
so a while later I was told that he was gay,so ok fine.I was a little confused why he'd leave fb like that considering he's damned near 30 but was told it was because he doesn't want his parents knowing.
A few months ago he decides to send my best friend a request on facebook,whom might I add rarely talks to him.still wouldnt send me one,even though we do talk and get along well at work,we have tons of mutual friends so it's not like it wouldnt pop up there for him.
Moving on to more recently,so we still play this parking y each other game a lot,I still catch him staring a lot. He apparently ran down a grocery aisle at the store just to ask my friend how I was (even though we work together).
He came out of no where one night just to make a joke and might I add complete space invasion with as close as he managed to get.
I was pretty late getting into work last week and he completely altered my schedule so I didnt miss any time at all let alone get in trouble for it (which I know he's not supposed to do)

I also find him joking around with other girls a lot but will keep looking over at me,or if im joking with a guy ill find him staring quite a bit as well.


So yes im confused.If he is out as gay then would this not be peculiar behaviour for said sexuality?
Its definitely not that I mind it,im just confused by it,my sister,whom is also gay and works with us finds him peculiar as well.