Thanks for any replies in advance..

I started the dream in a room which I felt was a friends house. I'm talking to an old friend who when I was much younger had a bit of a crush on. We start talking about relationships and other sex related topics and after a while we start flirting with each other. I feel like I want it but know I can't due to having a girlfriend. (I have this girlfriend in real life and also in the dream). Throughout this time no moves are made and nothing is done about it. However there is a large amount of people staying in this house so we end up sharing a bed. After some time talking in bed the girl tells me how she always liked me and we start to kiss. I feel like I really want it but know it will have to stop soon. I then remember or realise that my girlfriend is in a room across the landing to me. After kissing for a while the girl tries to make things more sexual and I say something simliar to "I'm really sorry but I have a girlfriend". She then stops and I still feel like I really want it to happen. She then stands up and says "why won't you have sex with me?" As she says this I see my girlfriends shadow move across the landing in the other room. After this the girl leaves the room to talk to friends and shortly afterwards I follow. She seemed to be talking about what happened to a group who I felt like I know but only vaguely as acquaintances. They say that its a bad idea if we sleep in the same room and that I should sleep somewhere else. I felt almost down heartened about this however I knew that in the dream I still loved my girlfriend. I then think that I should go to my girlfriends room to sleep and here it gets a bit vague. On the way to my girlfriends room I start to follow one of my old friends who was a very good friend (as in one of my best friends in childhood). I follow for a while as he goes very quickly through corridors until we end up in some sort of shopping center which feels like a market in Africa (with street sellers etc.) but in a very modern building. He seems to be going to work as he is in a suit and tie plus he also seems like he is in a rush. He starts to quicken (not running but as if its in fast forward) and I struggle to keep up. I feel at this one moment that there is just one thing that I need to do and that is to keep up with him.

A bit of background, to start with I really feel like I love my girlfriend in real life and in dreams. I have had dreams about almost fully cheating on at least 5 occasions within the last 6 months. We are quite young, separated by a school year however I'm 20 and she is 18. We often talk about the future and how one day we will settle down and have kids etc. (talks of our dream house and what we will buy) We currently go to University in the UK but live approximately 3 hours apart and due to cost and difficulty of seeing each other we visit every 3 or 4 weeks and see each other lots in holidays. For the second part so to speak, I still vaguely know this old friend (would say hi on the street and maybe have a chat but nothing more than that) My life is going pretty well and I am proud of what I have achieved etc. I don't see this guy as being particularly successful which I assume would be the obvious thing to gain from this. (not sure any help would be appreciated!)

Was really wondering what the first bit (which is recurring unlike the second bit) means and whether there is any reason to have these dreams lead into each other?

Thanks, any more details can be given if need