Usually nothing just that the guy wants to have a friendly conversation.
He wants to get to know you...
either was really in the conversation or likes you
Either that or he finds the topic of conversation fascinating or amusing.
Keep on the conversation. NEVER say "So, how's it going" It shows the guy that you don't know what to say and that you are nervous.
Wondering why you're looking at him.... Or he likes you
It could mean that he likes talking to you!
He is trying to start conversation which means he likes you!
It depends on the gender of the person she is speaking to.
The conversation(and the girl) was obviously was on his mind. Your best bet is to ask him.
it probably means hes just nervous and is nott willing to start a conversation with you. Instead you should start the conversation with him.
By having a conversation then it starts to slow down...Then lean in
it normally doesnt mean much if its only an hour