Question: how to know that he's falling in love with you?
Answer: He's a perfect gentleman. He is working hard to make a lasting impression on you. ... 
He loves how weird you are. ... 
He wants to protect you. ... 
His body language is all off. ... 
He gives you all of his attention. ... 
His smile says it all. ... 
He can't sit still. ... 
Your sex life is off the hook.