Why does this girl keep lying to me about something so stupid?

[MM]

Nothing to be confused about. She doesn't want to get rid of her Twitter account. Especially since Twitter isn't the problem. It's her inability to say "no" and set boundaries. So instead of telling her what you want and expecting her to go along with it, ask her how she wants to handle the situation. If she sees nothing wrong with just continuing things as they are and letting these guys believe what they want to believe, and you're not okay with that (which is entirely understandable), then you have to decide whether you can live with it or let her go. But stop asking this question and expecting a different result when you haven't gotten one so far, because next time's not going to be any different.