This is getting even more confussing..? (Please read my other question first if you haven'f already)?

Well first off, if you haven't read my previous question under love and relationships, read that first, then read this; because this is resent. So, as you know, I like Nathan but he has an a** of a girlfriend Sadie. I thought I didn't like him anymore about a month and a half ago, because I was going out with his friend Kory; until I found out Kory was using me.(im not getting into that) About 2 or 3 weeks ago i was walking around with my friends and I saw Nathan. I thought he hated me because a month ago he texted me to f*** off, but i thought it was Sadie. So, Nathan walked towards us and we started talking like nothing happened in the past. He gave me a hug goodbye, and I went home. I was really happy I thought things were going great. He also said I should have never went out with Kory because he's a jerk. That night i called my friend Kyle, who is also friends with Nathan, and he was with Sadie. She took the phone from kyle and started talking to me saying things like "hey natalie, your my best friend" and "your my best friend in the whole world". i obviously thought she was making fun of me so I hung up. then she IMed me and now she is alwats bothering me. I was having a bad day a week ago, and Nathan said he hopes I feel better. Then two days ago, I was playing feild hockey with his brother, The coach said there will be a game the next day at 2pm. i texted matt (nathans brother) asking if he was going to play. he said no because he was working. Apparently, matt told nathan i was still going, so nathan went. whenever i had the ball (we used a ball because its safer than a puck) nathan chased after me and sometimes stole it. Even though we were on opposite teams he said "nice" or "good job" whenever i played well. then i tripped and he asked if i was ok, and i said i was fine. After the game ended, he said I could do alot better than Kory, because im better than him. I'm extremely sorry for writing alot, but i would highly appreciate it if you would take the time to give me some advice, on if he likes me, and what i should do. thank you soo much!!!!