The 37-year-old actor said she realised how "toxic" her behaviour was after her then-boyfriend pointed it out, reported Entertainment Tonight.
"When we first met, we fell madly in love and I love the dramatic exit. There is nothing I crave more. The first year, you are working out your kinks. I loved it.
"We'd get in a fight, because we would fight a lot, and I'd, like, yell something then slam the bedroom door, then I'd slam the front door, then I'd get in my car and then I'd skid out the driveway and I would sit around the corner in my car and it felt so good and I realised how incredibly toxic it was only after he pointed it out," Bell said.