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How to behave in this situation?

Hey guys.

I met this guy on a party and we talked and laughed with each other a lot. Then later we spend the night together but nothing major happened. The morning after I had to go before breakfast. And at home I realized we haven't exchange our numbers so I searched him over fb and then we messaged each other but now its going like backwards..sorry my English isn't so good to describe this..and I'm still eagerly waiting for his number..yeah I also could ask him about his number but I'm afraid of it and maybe he doesn't want to give it out. Oh and he's a friend from my sisters husband, that complicates the whole thing, cause I don't want to have a bitchy reputation. I'm so confused about him and the situation. Help! Thanks in advance:)
How to behave in this situation?
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