Is it normal for a guy who likes a girl to text back slow to her?

Like you can see he has an interest in you when you are around each other. When you give off signals, they don't look away or try to look for the exit. Do guys have a tendency to do this? What does it mean? Are some guys just not into texting that much? Are they oblivious to it? Would they rather hangout with that person more so than text them? And when we do text its not boring or short. Just takes a long time for him to reply back.