What does this terrible cheating dream mean? ; - ;

I just woke up feeling absolutely terrible. I know you're not suppose to get worked up about dreams, since they're not real and all, but this one really affected me..

I've been with my long distance boyfriend for about a year now. We met in a game, and I have just left his place after 2 long months of seeing him, and i miss him more than you can imagine. It's really painful being away from him.
Thing is, in the past, he's had a horrible jealousy issue, and that has affected me as well. never in A MILLION years would i cheat, and he knows this, but since i've met him, i've never been so alert and attentive to the feelings of that before. Anyways,

This is only the 3rd day since i've gotten back home, and i went to sleep last night to have a dream about how i was playing with this random girl outside. Suddenly she put me against a wall and we madeout and she took me to her room. When we got to her room she was just showing me pictures of her siblings when it hit me, "i cheated.." and i suddenly felt a wave of terror come over me and complete sadness, since me and mt boyfriend last night, were talking about, in real life, about how this girl on youtube we were watching talking about how she cheated on her boyfriend. it was very upsetting to me and my boyfriend, since we're sensitive to the topic of cheating. His parents had to deal with it and so did mine.
I like to play What If games and asked my boyfriend "if your girlfriend tells you she was flirting with another guy and he was flirting back, what would you do?" and he said he would leave, no question. I feel this is the right thing to do too. In the dream, however, i realized he was going to leave me. So when i left the girl's bedroom, i saw my boyfriend waiting outside the door, and he looked very upset, like he knew. I'm sure he was wondering why i was alone with this(now the girl i kissed, suddenly turned into a boy) boy. i ran and jump hugged him and told him i loved him so much and i missed him, and he carried me away back home. i didn't know if i could tell him what happened because i couldn't lose him, he's the love of my life, but i knew eventually i had to, and it was breaking my soul.

As he was carrying me, i could hear shakiness in his voice and asked if he was alright, and he was getting all choked up. I think he knew what happened, and was trying to keep it together. I couldn't keep dreaming this terrible dream, and i ended up waking up tearing a bit.

Thing is, i've had dreams where i've kissed another random guy, or in one case, one i knew from A LONNNG time ago, that i never think about anymore. I never want to do that in real life, never in a million years. I want my boyfriend and only my boyfriend, so why do i always have these dreams when im away from my boyfriend?

Thanks for reading the story .-. I'm just wondering what's wrong with me..