How do i know if he likes me? Options

[cloudcandy]

i\'ve been friends with this guy since last semester and i started liking him since we joke around, talk and play around together a lot. i think he likes me back by the things he does such as: trying to get my attention all the time when i\'m doing my work, he starts smiling as i walk into class,he\'s rude to me for no reason then he says: i\'m just joking, he\'s always looking me up and down, whenever i\'m talking to someone in class, he\'s always budding in the convo. so i was convinced that he likes me but there\'s this other girl in my class who he talks to; they laugh and joke around too but not as much as we do and yesterday she never came to class so he said that he missed her then i was jealous but i pretended that i was ok then i said to him: \"aww, she will be here tomorrow\" then he said: shut up, ur just jealous because i don\'t miss you when ur away\" was he just saying that to get me jealous? and one more thing, whenever i talk to this guy in class, he\'s always saying: \"ohh, i see u found a new best friend\" is he saying that because he\'s jealous? sorry that this is long