I’m “OBSESSED” with my teacher

I’m not seriously obsessed, but I have crazy fantasies. And I’ve had the same boyfriend for the last 3 years, and these fantasies make it feel as tho I’m cheating.

I had a dream that the teacher and I had to go somewhere and we were in my car, and we kept flirting and talking, and he grabbed my hand, and we just kept flirting but inside my heart fluttered and it felt so real. (I haven’t felt like that in three years) and later on in the dream he kissed me, and I’m not sure what happened after.

I know I love my boyfriend and I want to be with him and this teacher thing would NEVER happen, but it feels like I’m cheating and it’s wrong. HELP!?