you think you know when you don't

I am regreting my abrupt decision to going away with Dave to Berlin in early August. Last night I went out with Dave for a Japanese meal to talk about our trip together. I had the feeling during the day at work, he didn't want anyone else to know about the trip we were about to go together on, in case people thought that we were a couple. I felt like yelling at him and saying who cares, you are going home in a few months and there ISN'T anything going on between us, I will make sure and clear about that to everyone should they ask. Yuck, go out with Dave, enough said. Dave works in CSU which is basically specimen reception and preparation. Before I left back in January 09 to go back to Oz, I got him in contact with Jackie from Reed Health who has now switched him over to having a better pay package.
Our dinner didn't really go as smoothly as it should have. As you begin to get to know a person once you're out of the working environment, you begin to realise how different you are to them. The only thing I had in common with Dave was that we work together in the same medical industry and we are both from Australia. Everything else differed greatly. He preferred paying for branded clothes in high street shopping areas where as I can easily go into Primark or Uniqlo or H&M to find my bargains. Our talk about the trip was quite was unsatisfactory, I suggested that we stay at a hostel to meet other people while he said that he likes to have his own time alone and rather a hotel. So he suggested that I can stay in a hostel while he stays at a hotel. Go figure.
I think it came to the point where he became really comfortable with me at that stage. With what and how he felt about me, he started describing about my character as a "outsider" describing to me my actions of the way I've come into the laboratory to work. He said that I am a person with attitude, I felt extremely offended and asked him what he meant. He said that I walked around the lab like I was stuck up and that I was better than everyone else. Then because I confided in him about how crossed I was about the lateness issue with Alison, he said that I shouldn't be complaining because I should be greatful that I have a job and that I should be happy that I have a job to go back in Australia. Having him say to me when he didn't know me at all, I was deeply offended. I told him that I was extremely greatful for my job back in Adelaide and that I am very happy I have that to go back to when my UK trip is over. I explained that there must have been some misunderstanding but he didnt want to listen.
After this, Manchester texted me and wanted to meet up, I suggested to him that we all meet up and explained to Dave that Anthony was a great chef who has earned a michelin star is about to star in the youngest masterchef launching on TV in September. He has also scored a place in Hell's Kitchen after masterchef.... Dave had no incling nor reaction to anything I said, his reactions were mundane and monotonous. Nothing I said seemed to impress the poor guy. So I bluntly said that he was someone that was hard to please... to my surprise, he willingly admitted that he was. With that, the mood of the evening was set. After dinner, Manchester was running late, Dave departed back towards Tooting and I headed for Bayswater to meet up with Manchester. I am seriously having second thoughts about our trip. Even on facebook, he checks everyday along with gmail. He has not added me on as a friend on there so I have taken it off today. I might start looking for hostels in Berlin.