Why do girls often send me text messages when they have boyfriends?

He often sends you messages because she is not satisfied with her current boyfriend. You are her boss. It won't do her any harm if you keep a good relationship with her. The most important thing is that she may really like you. Maybe she can't live without her boyfriend for some reason, but that's temporary. If you like him and feel happy with her, just tell her. Maybe he just wants you to take the initiative and help her overcome the obstacles in her heart by sending you text messages. I wish you happiness!