How can you tell if a guy is getting attached to you and falling for u?

my old friends with benefits and I haven't spoken in 7months because we had a fight... now were talking. we hung out for the past 2nights and might be hanging out tomorrow... He hugs me and holds me, replies to my texts no matter when I send them. stares at me a lot. makes me smile and laugh, and makes fun of me for stupid things I do lol told me that he wants to volunteer at the hospital so he can work with me. were both 21 and military :)