Why is he doing like this?

There is this guy who always tried breaking me with my love. I always made him know that I love my boyfriend only but no one else. He acted very fishy and even fighted with my boyfriend. He was completely determined to break me with my love. He tried many ways to break me and him and finally after I made him clear again that I would never stop loving my love he blocked me everywhere. What's wrong with him?

Why is he doing like this?
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