I'd mention the dreams in a joking manner and watch how he reacts..

sounds like your subconscious is picking up on something. dreams don't always mean something. and this doesn't make you suspicious. you have no control over your dreams.

Either you have deep rooted trust issues, or he's actually cheating. Life's too wonderful and short to be feeling the way you do.

speaking as someone who went through a similar situation, i hope you will heed my advice

i was suspicious of my girlfriend who usually gets a lot of attention from other guys. she trusted me with her email and instant messaging passwords so i decided to check up on her a couple of times. I found out that she was seeing someone on the side. but it didnt matter, I was invading her privacy

no matter what the intentions or the outcome is, we have NO right to check our partner's emails and private things.
dont let your paranoia get the best of you. dont resort to petty tactics. just confront him about it.
(but most guys don't cheat)

you're afraid. things are going well for you and you're afraid that he is going to leave you so you are trying to make up things to be able to put a distance between the two of you so he can't hurt you first.

i agree with the other posters in saying that it's probably a deep rooted issue and you are clearly insecure. maybe you should seek counseling or find someone that's been through something similar that you can talk to.

if your relationship is as amazing as you say, then you need to just have a little faith. you said you trust your boyfriend so start actually trusting him. dreams are just dreams. most of the time they mean something totally different than what they really are. in your case i think it has a lot more to do with you having let your guard down and you just being afraid to lose him.

whatever you do...don't snoop and play the jealousy card because you will just sabotage a good thing.

Probably just fear of things deteriorating, since you're so happy now. I wouldn't worry about it.

My SO sometimes has dreams about me cheating in horrible ways, but we both know that that would never happen, so we don't take that stuff seriously.

i know that when i have dreams like that i jump to conclusions too - and it may help you to go online and see what they mean so that you can put your mind at ease since you haven't found anything to lead you to believe that he IS cheating on you. chances are there are just things in your life that are leaving you a bit upset, and you're just placing it on him since he's the one that you're soo involved with right now.

The advice from Jules and Jude is right on. I had these dreams too right around the time that I got insecure when he wasn't as "touchy feely" with me as before (turned out, he was really stressed about work). We talked through the actual problems and I joked once or twice with him about the dreams. Jumping to the conclusion that your SO might be cheating on you is only going to make you feel like crap. Try thinking about all of the reasons why he WOULDN'T cheat on you. I bet there are some pretty compelling answers to be found there. When I think about that, I realize that I'm awesome and he's lucky to have me

You should definitely trust your gut feelings. I trusted mine, snooped through my bf's email and phone and caught him cheating...twice. You know when there's something wrong.