I'm not sure that "cheating" can be achieved after only a week's worth of dating! How can you enter a monogomous relationship within such a short time frame? Sure, maybe you had a really good time......maybe you BOTH had a really good time, but I'm not so sure that is long enough into a relationship to say that you are exclusive. Think about it! Think about the things the two of you DON'T know about each other after such a short time. Relax and enjoy yourself. Obviously the two of you were and may still not be of the same mindset. Take some time to get to know each other better before you decide he's "cheating". This may be a way of life for him. Again, the two of you are obviously not in the same mindset at this point in time!