I don't trust him at all

My fiance and now father of our daughter has gotten a promotion and his boss is only 2 years older than him. She takes him out (and only him) to lunch, calls numerous times on his off days, sends numerous texts (some which have been deleted for God knows why) and I get a call from him an hour after he's supposed to be off telling me he broke down but not to worry because she's with him and will bring him home, then get another call that he's borrowing one of her cars so he can still go to work. So now they're going 2 hours away to her place to pick up a car from her. Any of this seem fishy or am I just being a crazy jealous bitch?