Me and my boyfriend spent a whole day with one of his acquaintances I've never seen before. He made me feel VERY strange. I can't stop thinking about it and decided to get some unbiased opinions from anyone who might be willing to help. Any ideas are welcome.

The behavior of this guy was generally normal (yeah right, he's a friend of my b/f), he did not do or say anything strange, except for several things:
- he made eye contact with me every time I said anything so that I always had to look away; every time I tried to look back into his eyes for a second (not to seem too shy) it was UNBEARABLE. I had to put on my sunglasses. Felt like he was trying to find something inside my soul.
- I noticed he was ALWAYS standing right opposite from me facing me directly if we stopped to talk.
- He said a few words about that girl he fell in love with this summer but I had this very strong feeling you usually get when someone wants you badly, like if there were small currents of electricity running between me and him.
- He also mentioned he quit drinking but right before going home he got himself a bottle of vodka and said that he decided to get really drunk that night.
- As far as I know (from others) this guy is quite a reliable and respected person.
- I didn't feel attracted to him, just awkward.

He came just for a couple of days but he as well might return and then I might have to help him with some projects if he asks.

Is he a mean macho that tried to seduce me right under the nose of his friend? Should I be careful and avoid having anything to do with him?
or
Did he just behave normally and I am just being stupid and making it all up?
or
Did he like me a lot but couldn't show it in any other way cause my b/f was there all the time? And then I don't need to be afraid?

What would YOU think in my place? Please, people, I need your help.