Why won't my crush text me back?

I have a crush on this guy in my class that sits next to me and he was one of my first friends when I came to my new school this year. He is very cute and sweet. I asked him for my number and he gave it to me. But then, the first few time I texted him we had an actual text conversation. But, he... Show More

We talk a lot in real life but he barely texts me :(
He always pulls the "I'm busy" card, but I think he's lying.