Pele, you asked if it means that you are falling in love with your teacher. Are you having romantic feelings about him? Sometimes kids kinda think teachers are hot and have a mild crush on the teacher. That sometimes can be okay. As long as it does not become intrusive in any way on any level.

You asked if it means that you feel guilty because you have done something to him. Have you done anything to him??? If you are having feelings for your teacher and its causing you to have upsetting dreams, it might be a good idea to talk to a therapist or school counselor if you do not have a therapist. Because sleep should be restful. Not disturbing for you. Know what I mean?