Do you believe dreams have meanings?

I've been having dreams lately that my husband wants to leave me or he finds someone else. We've been together for 4 years now and have a 7 month old son. About 2 months ago, I started having this feeling that he WOULD cheat on me. But he keeps reassuring me that he would never do it. But I don't know. My dreams are playing tricks on me. But do you ladies think these could be signs? Or what?