Friend x sex. Need an advice please!

I had a gang. Full of party animal people and i'm the only girl. We've been hanging out since april. And last week when we were out for party, i just knew it that everyone in the gang think that I'm going out with Kenan(one of the guy at the gang). We're just bestfriend since 2 years ago.
Natt (also one of the guy on gang). He's the one who asked me.
On the club,i saw Natt and the other guy were talking. I approached them and suddenly the other guy asked natt, "what do you think about her? bla bla bla. Why don't you go out with her?" And Natt asked "you and kenan are together right?" I said no. After he smiled and said "yes, she's cute. She's 9 out of 10."
Annndd We spent the night together bang bang.
We never talked outside the group chat before, even when we met ou, we hardly talking. In the morning, he's looking normal like smiling and taking care of me. But i just feel awkward like I said we never talk. And when I'm going home. He said, "if anything happens or you need anything just call me.do you have my number?? Oh wait I'll take my phone give me ur number"
But instead giving him my number, i saved his number. So he doesn't have my number.
So what should i do now.. Should I contact him? But it is been a week.
And what do you think? He just using me right? No feeling involved like other guys did....

Thanks

So he enjoyed having sex with you? Alright

Did he develop feelings? Probably not. He just enjoyed the sex.

If you're into guys like that go ahead, but if you want something more fulfilling look elsewhere.