Most Helpful Guy
The confusion you feel is exactly why guys should ask the girl for the phone number. He needs to put his interest for you out there even if rejection might follow.
When a guys gives his number and doesn't ask for hers, the chances of her calling him are minuscule to none. It is the guy who has to take the risk of the rejection if he hopes to go out on dates.
What this guy did was extremely weak. It lacks confidence and shows low self-esteem. A message to guys: ask for the phone number if you like the girl.
Most Helpful Girl
When 'He gave me his number and said...' he may have thought by him Initiating this gesture, that if he had at 'First' asked you for yours, he may have not wanted to blow it by having you think he was forward By------Ask me for my number.
I see no harm in what he did here, dear. He and you appeared to have started off on the right foot all night and I also recognized some special chemistry that could very well Continue and bloom if you take him up on his gracious offer of... if you want just want to to get coffee or something...
Don't be 'Confused,' he is Definitely 'Interested' or he wouldn't have bothered wasting his time with you at this social event. Instead, he could have put you on his pay no mind list and just stayed a wall flower... the whole night.
Good luck. xx