I feel like I'm missing something. He asked you to join a group going out for drinks, you let him know you were married in case he was asking you out. So far so good.
Now he is waving and smiling at you? I guess I don't see the threat here. It sounds to me like he is being friendly and may even be getting a kick out of you thinking he was hitting on you. He could also being trying to save face and continue his friendliness despite your marital status specifically so you won't think he was hitting on you. IMO it's an embarassing situation all around so I'd let it rest unless he makes more specific overtures which are inappropriate.
Now he is waving and smiling at you? I guess I don't see the threat here. It sounds to me like he is being friendly and may even be getting a kick out of you thinking he was hitting on you. He could also being trying to save face and continue his friendliness despite your marital status specifically so you won't think he was hitting on you. IMO it's an embarassing situation all around so I'd let it rest unless he makes more specific overtures which are inappropriate.
I told him my husband wasn't and I wanted to be home with DH and my daughter. There were many other 'things' with this guy that were on the boarder of harrasment.