Like attracts like and you being a newbie, hes probably in love already;-)
I've been able to spot people like me for years, for me its not even the amount the drink or their behaviour but what they say and the way they say it...y'know small comments that others may overlook...
If you meet again, which as Carol said shouldn't be in a bar or restaurant for your sake at this stage listen to what he says and try and pick up on things, like when he is talking about his life, work, relations etc...more than often people are trying to tell you something without actually telling you, look for the litle comments at the end of the sentence or the comments made whilst he is laughing or joking it off...generally that is what the person is saying...interesting stuff!