How do you know if a man is falling for you?

I have been friends with a guy since last summer. We’re seniors in college and usually hang out at school on break twice a week. We didn’t really hang much outside of school all but once every few weeks, but recently he’s been asking me to hang out ⅔ times a week. He says “whatever you want to do is fine with me.” We’re going to the Zoo, and I know he doesn’t like it because he said it awhile back, but now he’s acting excited.

He’s the definition of a nice guy – holds doors, elevators and comforts me when I’m not at my best, etc. He never wants me to go out of my way, but he will go out of his. Sometimes he pays for dinner and things here and there, and offered to buy me a massage last week. He has held my hand once some months ago, and last night at the movies he reached it out to guide me up the stairs, but I wasn’t paying attention. He’s always fidgety when we go the movies. He invited me to his house this week to watch movies because his mom will be out of town but said “I’m not trying to be weird, lol”. We always hug when we depart, nothing more has happened.

He’s 23 and never had a girlfriend, this may help. I like him, so I’m at a loss if he likes me, or is just being nice. Thank you.