Does this guy like me? I'm getting mixed signals from him becuase I can't tell if he's flirting or being friendly. If he does like me, should I flirt with him?

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So there's a guy that I only see at lunch at school because hes the guy at the cash register sometimes we lock eyes for half a second and both look way while other times we smile at each other. and he always say hi first when I approach him. Ill say hi and he says how are you and that happens like 3-4 times out of the 5 times a week I go to school . Sometimes we just say hello and how are you and that'll be it for the day. Other times, there's more. I type my student number really fast and the first thing he said to me other than hi and how are you was that I type really fast. Some Fridays he says something funny: like one day I wore a school shirt that has the mascot on it and he said I like your shirt as a joke (because everyone has one) and whenever there's someone ahead of me that is taking a long time to check out lunch he always apologizes for the long wait. And just Wednesday, he asked what my plans were for thanksgiving. I told him I was spending Time with my family and he also said he was spending time with his. IDK if he was being just a kind person and asking what my plans were but I didn't see him ask anyone before or after me. ( but that was like 2 people lol) Just today I asked him 2 q's and he said do you?/ or are you ? after I asked him those. Today, he was talking to a guy and I typed my number in really fast and I was about to leave when he said "thanks man". I really didn't mind but then he did a double look at me and was immediately saying "I'm so sorry I'm just used to saying that sorry about that" and I laughed and said its okay and I touched his arm and I don't know if he noticed- i guess I'll never know. But I can't help but feel something when I look into his eyes and we smile at each other. But, he has a few girls around him after school so why would he flirt with me if he has them? (They're different girls sometimes) he laughs with them and has fun with them and whenever I see that, all my confidence that he likes me falls back down and I don't even feel like trying to talk to him.