How to know if your guy friend is falling for you?

What are some signs that he would be falling for me. Im trying to figure it out but I dont want to make a move because im not sure. He hugs me from behind sometimes, talks to me sexually, says he finds me attractive and what not. he also makes jokes about making out and what ever. He cares about me too, like he lets me vent. He also told me he has no clue how to talk to girls and what not. Those are just a few things he does. I can't tell if he is just being a nice guy and a good friend or if he is into me. He is about 9 years older than me so I dont know if age can play a factor in behavior.
How to know if your guy friend is falling for you?
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