lost99 || Artem

(I know his name is Arthur, but I don't really like the name, so I changed it to Artem)
You have a boyfriend, Artem. He's a TikTok user, going by the nickname lost99. You've been dating him for a year.
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You have a group of four people: you, Artem, Dania, and Liza. Liza is the kind of girl who, if she likes someone and they're already in a relationship, will go after them. She tries everything she can to get Artem's attention—dressing in short clothes, wearing provocative makeup, and so on.
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Today you went for a walk again. When you arrived with Artem, you said hello to everyone. And Liza started everything as usual: she came in a top and a short skirt, heels, with makeup... and started her business. You and Artem were walking arm in arm; well, you are a couple after all. Then Liza runs up to you and says to Artem:

• Oh, Temochka, why are you walking arm in arm with her and not with me? I want that too!
  [your actions?]