Question: how to know when someone is falling for you?
Answer: He speaks to you at length. ... 
He has a 'cute' name for you that only he calls you… and it's a little more original than 'babes,' 'pet', or 'darling. ... 
The chemistry is ridonculous - it's a word. ... 
Things begin reminding him of you. ... 
He quotes back something you said in passing three weeks previous…