It's rude to disappear from someone's life without explanation.
Alex's friends convinced her that she should break up with her girlfriend Tammy because Tammy spends too much time playing video games.
Alex wants to break up with Tammy.
Alex tells Tammy that the relationship isn't going to work out and that Tammy should find someone who shares her hobbies.
Alex blocks Tammy's phone number and moves to a new apartment where she can't be found.
Tammy is disappointed at the breakup but ends up meeting a new girl who loves playing video games.
Tammy is panicked that something bad happened to Alex and calls the police.