My crush's friend teases me and calls me sister in law?

Anonymous
Me and my crush used to flirt with each other a lot. Planning future together also. But he said he used to like someone. And also started to kinda reply showing no interest. So we stopped talking. He used to act like my boyfriend. After few days his closest friend started to talk to me and started calling me sister in law also he used to tease me that I'm his girlfriend. We will be getting married and all. He also tried to flirt but I never let him do that. He used to insist me to talk to my crush and put efforts. And he keeps talking daily. Also one of his friend started talking to me and tried to know my likes and dislikes. And another friend of his started to say if you want I can set you both together. He also likes you. I don't know if he is playing with me also making fun of me in his group or wants to prove his friends that he is popular.
My crush's friend teases me and calls me sister in law?
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