First I want to mention that I know this is totally wrong. Well, I am 23, he is 21. He lives in germany, but came to Miami for 6 weeks. He stay at my house with my mom, grandma, and uncle. We seemed to liked each other, and we had sexual relations by the 4th night. Then, we kept doing it all the time...even the night before he left. WHAT CONCERNS me is that I asked him for his email to keep in contact with each other, and he said NO. Also, after that, we were doing it, and I told him that he had to come again so that we could do it more, and in the middle of it - he nodded his head... so, I don't understand him. We did it many time, he seemed to liked me, I don;t understand why he wound't give me his email. There are 3 possibilities, maybe he doesn;t like me, he only took this as only sex, or he thought this was crazy. I can't think of other reasons why he wounld't give me his email... can you please help me, tell me your opion on why do you think he didn;t give me his email.. thank you 
