Why is a guy suddenly so mean to you?

colorful123
There's a guy I first talked to online and he was funny and nice. We then met up in college and during first week or so he was teasing but funny and had meals together with other friends. Then after one night he suddenly started to become SOOO mean. He would ignore my messages or tease me in the weirdest things like my username. I tried to talk to him but all he does is be mean. But one time he kept calling me on snapchat until I picked up and all he would say is hey so how are you or what's up. Then when I said I'm in lounge studying he visited later to give me high five. So confused why is he so mean and does stuff like that but mean again?
Why is a guy suddenly so mean to you?
8 Opinion