Why do his friends still stare and he watches from afar at me?

I had very often eye contact with a guy. He stared at me and all in all it seemed very obvious that he likes me. Even his friends make naughty comments about me. He and his friends caught me a few times staring at him. But suddenly it stopped. He began to ignore me absolutely and I tried not look if they still watch me. But I recognized from the corner of my that they still stare. Last week I met some of his friends I only know about instagram. They stared and laughed at me although they don’t know me as well..
Why do his friends still stare and he watches from afar at me?
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