Should I give him another chance?

The most popular, funny, cute and awesome guy in my grade used to like me but I didn't realize it until he stopped and started to completely ignore me. While he liked me I liked him too but neither of us knew I guess. So when he started to ignore me I did too. But the day before the last day of school he was being friendly and talking and joking around with me and my friend Anna like he used to with me when he liked me. On the last day of school he kept glancing at me and lingered around me for a moment. Does this mean anything and if it does, should I give him another chance or just forget about him altogether?