And in case you don’t believe whatever I’m saying read here: “Type B (alias Type Dere or “sweet”): These Tsundere have deredere as their default mood. They are sweet, kind and generous, but just happen to have a hidden violent side as well. In this case, temper is almost always triggered by someone or something else, usually a Love Interest. Either they have Belligerent Sexual Tension, are an Accidental Pervert, or just have no idea how to handle feelings of love and attraction. May also overlap with Violently Protective Girlfriend if her Love Interest is threatened or in danger.
Type B should not be confused with a Yandere. If a Type B Tsundere were really convinced that their Love Interest didn’t want them, they would revert back to the deredere side and probably enter an I Want My Beloved to Be Happy phase.”
I bolded the parts that special attention should be given to. Definition thanks to tv tropes- http://tvtropes.org/pmwiki/pmwiki.php/Main/Tsundere