Now before starting I have to put it out there that I usually don't put much thought into my dreams (mostly because they tend to be abstract). This dream has been upsetting me and I guess I'm just looking for some insight. My dream started as I was getting ready to go to the second of two concerts, the first which I had already seen, and was excited to see the next one. My boyfriend, was there waiting for me yet I told him to go ahead, as I still had to do somethings before being able to go. He left, and I ended up running very late, so late I had missed everything, and even he had left. Feeling sad, and upset I began to walk and found my self at an open field with beautiful grass, and just beyond me a building, I walk towards it and recognized a friend(while i recognized them to be a friend, I have no idea who it was), and an attractive man sitting next to her, they asked if I wanted to tag along and I did. We walked inside the building to find a very nice and large pool. We begin to talk, and I find myself attracted to the man with my friend, flirting, playing around, I jumped into the pool then called him over to me, butterflies in my stomach, he went and placed his arms around my neck, and then I kiss him. Suddenly he backs away telling me that it wasn't right and that he wanted nothing to do with me while I was with someone, and that he didn't respect me. And this is what really has gotten to me over the past day, I responded by saying, he doesn't matter, I don't truly love him, not anymore at least.
The rest of the dream was a blur, I simply remember leaving and trying to tell my boyfriend what I had done, feeling extremely guilty about the situation.
I know it sounds silly, but the fact that I could even dream that terrifies me, I've been with my boyfriend for 5 years throughout which due to outside circumstances we have always been in two separate places, and I'm starting to wonder if this dream is telling me something I don't want to hear or even worse say.

You are cheating on your dream for a reason. It's a common dream symbol that reflects your deepest feelings about your relationship. Here's a link to the definition on this site: dreamdoctor.com/dream-dictionary/definitions/cheating.html You clearly need more that what you are currently getting in waking life, so you found it in your dreams. Doing so made you feel guilty in the dream. Feelings in dreams are never disguised, so the fact that you felt guilty in the dream means that you feel guilty about straying thoughts, not that you want to or will stray. But, your unfulfilled needs are percolating up in your dreams. You'd clearly prefer to get it from your boyfriend, but it isn't happening. So, let him know. One way to bring up the subject is to share your dream. A dream about a flirtation with a guy you don't know is far less threatening than telling him or having him find out about a real flirtation. Living apart can't be helping matters and may be responsible for some of your unmet needs... or maybe, after 5 years, the excitement, attention, romance has begun to wane. If you can present this to your boyfriend without him feeling threatened (after all, it's only a dream), he should take the hint and ramp up the romance. If you tell him what you want, you're more likely to get it than not.

Good luck!