Is it normal that i dreamt about cheating on my girlfriend in our own home?

My girlfriend and I have been dating for more than a month and im completely in love with her. In my dream, we had our own place, two of her family members were with us visiting. My girlfriend had been called to go into work for two hours. I was left with them both, while one of the was in the living room, i was with the other. We were texting each other, and she pulled me to show me something. We were in the bedroom, she laid down and pulled me on to her, i got off told her i could. She got up grabbed me and kissed me and i kept kissing her touching her then i hear my girlfriend pulling into the drive way so we fixed ourselves and got out the room. She came in so eager to see me hugged me and kissed me.. she went to talk to the other girl while the girl i wad with, we went into the room locked and began kissing, then i stopped and asked her if she was going to tell my girlfriend.. she says of course not and gets on top of me, i heard my girlfriend coming down the hallway and i pushed the girl off me although she didnt want to stop, unlocked and opened the door. We stayed in the room looking at the girl and my girlfriend while feeling on each other and then my girlfriend grabd my phone and seen that we were texting each other and she read the last text message out loud, "i want to show you something.." and she threw my ohone at mr and asked what all that was about. I stayed shut until the girl was about to tell her the truth and i said baby, she was just showing me pictures of you guys when you were small. My girlfrirnd stayed shut and i got up and grabbed her and told her i loved her and asked her why she acted that way. She says she was just exaggerating, then i just hugged her looked at her then my girlfriend ended the dream by calling me. I just want to know what the dream means, why would i have a dream about cheating on my girlfriend with her family member, why cheating, i love her so much, am i going to? I just want to know themeaning of this dream.