Why is he doing that?

There is this guy that I know and I've been texting with him and I like n he likes me to but when we txt after a while he sends me a txt that says that he has to go. So why does he do that

Because he has other things to do! Even if he likes you, you aren't the center of his universe, nor should you be.

Because he has a life.

Maybe he is not that into you or maybe he wants to appear cool to hide how nervous he is. Seriously, the basis of a relationship should be actual talking not just texting.

I know how you feel, maybe there is more thing going on in his life that you don't know about. maybe he needs time to figure things out before it gets serious between you's.