Was he using me for sex? What happened?

[Kylie]

I'll start from the beginning. I met this guy about 2 months ago. He's 21, I'm 19. I met him at a party that had been thrown at his house. I got drunk and spent the night...with him. No sex. Immediately after he was treating me as if we are together. I found out that he possible did meth but was too scared to ask and possibly accuse him of something like that. Immediately after, we talked and hung out everyday for almost two weeks. A lot of the times we would just hang out at his house and get drunk. I didn't mind because I like doing both things. I started spending the night for a week straight. We've had sex about 6 times. He always lead on like we were together. About a month ago I saw some texts from a girl whom he was "flirt texting" with. I got upset but acknowldged that we weren't together and that he could do what he wanted. I just didn't want secrets. After this conversation he has been very distant and very rarely wants to spend time together. The other girl has talked bad about me when we have never talked. Although I know this guy is a waste of time, I'm finding it very hard not to get my feelings hurt. I know the only option is to move on, however I don't know how to do this. If anyone has any kind of advice or ANYTHING please respond.