What does b mean in texting to a girl?

Hey there, I'm curious about something. I've noticed that in some text conversations with girls, the letter "b" gets used a lot. I'm trying to figure out what it stands for. Is it a shortcut for something specific, like "bye" or "be back soon"? Or is it just a personal thing that different people use differently? I'd love to know what the general consensus is on this. Can you help me out with some insights?