Please help me

Ok so while reading please don't judge or anything. I'm not looking for hate I just need help. I work a horse ranch and there's a guy who works with me. I'm 14 and he's 13. I'm a virgin and he's not. Well yesterday we were the only two people there and we were talking and getting to know each other because this was the first time I'd ever seen him there. We went to the bottom of the ranch where no one can see you and stuff to turn the water on. We only went to turn it on, nothing more, nothing dirty or anything. While we were back there we were playing around and stuff talking crap to each other in a playful friendly way and out of no where he slapped my but. Now keep in mind I am a very modest girl and I not just an easy one to get the physical from. Well later he asked for my number and I was sure. Hr texted me last night and said "hey I wanna f*** u" and I was like "no I'm not that kinda girl. I'm sorry but I really like u as a friend and ur chill and we had a lot of fun but Im not into that" and he was like "fine its whatever." then we started talking about stupid teenager crap but he still works sex in and I can't keep up with it. I really like hanging out with him and yes he's attractive but I like to get to know people and not just be a ho. Please help I dont know what to do except cut him out completely but I have to work with him.