Sex dream about boyfriends brother

Lol this makes me feel so awkward... I had a sex dream about him and it makes me feel guilty even though it's not like I actually did it. No idea why I had this dream, but I was dressed in sexy lingerie and I was making out with him .. Ive heard people say "dreams are just a concoction of what you've done over the past few days", but I definitely didn't make out  with my boyfriend's brother. 😂 do you think our dreams have real meanings?