They are dreams and you are 7 months pregnant. I wouldn't worry about it.
pregnant dreams are so vivid. they are just dreams. so do nothing. i had so many crazy dreams with my twins. having 17 babies at one time. being in a room, sitting in a metal chair, and someone brining me babies to breast feed like on an assembly line. sometimes they brought me a dead one and they just threw it in the garbage. watching two creatures that had mouths like the langoliers suck on their heads. my dreams with my daughter were crazy but not as wild as with my twin boys. <br />
enjoy those crazy dreams. but they are just dreams
Confront him about it and I'm sure he'll understand. Here's one of many ways of going about it.<br />
"I'm sorry, but I'm leaving you because I had a dream that you cheated on me."
It's just a dream. Most if not all pregnant women get worrying dreams in the last few months. It's just your brain trying to make sense of everything. Talk to your boyfriend and tell him how you're feeling. He's not a mind reader and extra attention from him could stop any further dreams.
you sound insecure, be happy & change