Need to know if this is legal

Okay so I'm 15 (5/7/99) and this guy is 18 idk his birthday exactly but its late 1995. When I was new to the school as a freshman he was the senior that we never spoke but he would flip me across the cafeteria then I would flip him off then he would mouth anytime. Irrelevant I know but I just want you to get the jist off the situation, and on the last day of school, seniors weren't suppose to be there and I went to get coffee for a sub for the first time in the faculty lab and he was in there for ISS lol but when I walked out the building he called out to me following after me and said his "friend" wanted my number then I got all sad cause I wasn't going to see him again and I got a friend request from a familar face and he wanted to hang out but the only thing that's stopping me is that I really like him but I don't wanna ruin his life if its illegal. By the way I live in TN
Asked Jul 25, 2014

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