If boys like girls, will they sometimes not return messages or text messages?

It's hard to say. You can't say whether he likes you or not because of this. Maybe something happened to him suddenly, or what you said overwhelmed him, or the signal was bad. He can't reply immediately when you send a message. No one can do that. If you want to know whether he cares about you, you can ignore him for a while and see if he will find you. Don't fly over when you first find you. If he just plays with you, he will only look for you a few times and then give up on you.