What is he trying to do?

We are in the second year of college. I had a chat with a boy the other day but it was very friendly way, just a casual chat. And we are not alone. We were like a group of 5 people. He sent a friend request on instagram the next day. When I asked my friends, they said "accept it, maybe he sent a friendly request." Because he was following almost everyone. He sent me messages the day after we started following but we didn't get that far with the messages. The messages he sent me seemed weird, they make me feel cringe but I didn't care it too much. Today we ran into each other on campus and he pretended not to know me. I don't understand what his purpose was. Whether we are friends or lovers, why wouldn't you say hello to someone you texted on Instagram?

What is he trying to do?
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