Why does my ex boyfriend make fun of me?

Okay, we have been apart for about 4 years now. But, throughout those years he would sometimes tease me or make fun of me. Like today I asked him how to get rid of a stye, he didn't say anything. Until he went to his close friend and told him what I said laughing until I saw him and he ran away. Why is he doing this?
Why does my ex boyfriend make fun of me?
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