It's bad to end a relationship by just disappearing.
Beatrice is dating Matt and thinks the relationship isn't working out.
Beatrice wants to stop dating Matt.
Beatrice tells Matt that the relationship is not working out.
Beatrice stops answering Matt's calls and avoids him.
Matt will know that Beatrice does not want to date him, and he'll move on.
Matt will be confused by the way Beatrice is acting and not know the relationship is over.