I texted him and he didn't answer.

I think maybe he doesn't know how to reply.

Imagine that he received a confession message, but he doesn't know you yet. He will feel suddenly and need time to adapt.

He can't promise you as soon as he receives your message. Unprepared, feelings are no joke.

Sometimes, so do i. When I received a text message that was difficult to answer, I simply didn't answer it.