I need to rant, and I need opinions

my so and I have been together about 5 months now, and I am currently 2 months pregnant. My so literally goes insane to the thought that I'm going to cheat. I can't work, because he's afraid I'm going to cheat. I can't go out with friends, because he's afraid I'm going to cheat. I am literally going crazy. He starts shit about random things (taking a bath, an apparently texting my "other boyfriend". I've had enough, and I need tips on how to make shit better, let him go, or go to jail for murder because boyyyy. this shit has me going NUTSSSS!! If I'm out with a friend I'm getting texts "you plan on being out all day, and clearly plan to leave me home by myself." FYI, I've never cheated or have given him a reason to ever believe I have. I need help. 🙄