British beauty Keira Knightley has revealed that she often wonders how her boyfriend Rupert Friend puts up with her, because she is so emotionally unstable.

The Oscar-nominated actress is currently dating her Pride and Prejudice co-star Rupert Friend, and admits she pushes him to the limit.

"I'm awful. I always have freak-outs. I don't know why anyone puts up with me. I'm mostly an emotional wreck! It's stupid s**t. I don't freak out about anything that actually warrants a freak-out,¡± she was quoted by Contactmusic, as saying.

Knightley claims even the smallest problem send her on a downward spiral.

¡°It's the little stuff I can't deal with. Anyone who has gone out with me will tell you I have this awful tendency to cry when I get really angry. And I can't stop. If I could stop it I would, because I can occasionally come up with some fantastically cutting one-liners in fights.

"I'll come out with one and say, 'Oh, that was great.' But suddenly I'll find I'm crying. And I'll be like, 'S**t, I completely ruined my one-liner.' It's annoying!" she added. (Asian News International photosource:justjared.com)