He didn't try to get you to send him explicit pictures of yourself, didn't even hint, and he didn't try to set up a meeting IRL. So, what it looks like to me is that he was playing, having fun, enjoying your company, including the flirting and sexting.

I don't know how far you went with the sex talk, but you didn't send pictures and he didn't try to get you to send pictures, so I don't really think he was "just using you." If he was one of those totaly creepizoid types, he would have been pressuring you for naked photos and more. Maybe he's just a flirt and player who enjoyed your company for a while.

But he's moved on, just like guys will do in real life. They like you one minute and the next minute they like someone else. It's probably in your best interest to just back away from him. If he's interested, he'll be in touch. If he doesn't respond, doesn't even open your messages, then you know it's over. You didn't say how old you are and how old he is. If you're still under 18 and he's at least two years older than you, it would really be best to stay as far way from him as possible. Too risky.

I'm sorry you've had this bad experience. I'm glad you didn't send any explicit pictures and didn't meet in person. He's moved on and it's time for you to do the same.