Guy troubles: Why did he say this to me?

This guy that I like is named Nick and he supposedly likes me because he told my girl friend and his friends and told me im pretty and also told my friend he would ask me out over a month ago (never did). Yesterday in Social Studies class, my friend Mike was trying to taze me as a joke (he has a girlfriend.) I wasn't trying to flirt with him. Later on, Nick came up to me in front of his friend and goes, "Olivia why do you try? You show off in front of all of the guys it's like get out of the f*cking closet!". With a serious face. I just smirked, but then I stayed away from all the guys because I was so upset. Then, Nick was walking down the hallway with his friend and out loud said, "Hey you!" and noticed he was talking to me and said "I'm gonna sit on you with my butt cheeks and have you suffocate" and I just laughed. Then he said, "Ugh I hate this substitute" for a class we had. Then randomly he said, "Sooo...you and Mike?" I wanna tell Nick how I feel, but I feel like I blew it because I think he's mad at me. I was going to text him how I feel today, but what if he doesn't reply? What do I do?