I had a dream an ex-boyfriend of mine cheated on me while I was with him. It hurt me a lot. I ended up finding out months later that he actually did cheat…. with the very same girl I dreamed he cheated with, around the same time.
The reason I was uncertain in the “relationship” then seems quite simple to me. He was being overly friendly with her and seemed to care way more about laughing and joking with her than he cared about paying attention to me. He would defend her, no matter how irrational defending her was. He was not happy with me for being upset after walking in on them acting all close and cuddly at school. Those two would act like I was being paranoid, over-dramatic, hurt, and worried for no good reason. I was stupid enough to believe them.
There were times when he would say really odd things that made it sound like he’d had sex before (and he was a “virgin” when he started dating me, or that’s the impression he left me under, anyway). After he started being all close and “cuddly” with that girl, he would suggest different ways to kiss, different ways to do things… It was just so odd. She also took a strange dislike to me (despite offering to “help us with our relationship problems” and was so defensive of him, even though she had a boyfriend of her own). I ended up asking one of our mutual friends (who seemed to really want to tell me something, but felt like she couldn’t because she ‘wasn’t allowed’) if she could promise he never cheated on me and she told me she couldn’t. After that, the truth came out.
So, yeah, .... sometimes these dreams should not be ignored. If something feels wrong in a “relationship”, something most likely is. That’s the way it has been in my experience, anyway….