The most dishonest thing I have ever done

It is hard to tell that I am a honest guy or a dishonest guy. I have done a lot of honest things, but I also done lots of dishonest things. Althogh I have done lots of honest things, today I'm going to talk about the most dishonest thing I have ever done.
When I was thirteen years old, our family had a lot of pets. We had two birds, two turtle , a guinea pig, a cat and a gold fish. Our guinea pig's name is "Gugu" and my sister loved it very much. One day when I was playing with Gugu, my cell phone rang. I put it on the balcony and go pick up my phone. An accident happened suddenly. I think Gugu was too exciting at that time and it jumped though the barriers. It died. I felt so nervous if my sister know the truth. So I lied to her that our cat ate it. It's the biggest lie I have ever said. Our cat was punished by my sister very hard and it hated me. I had told my sister the truth very long time after that accident. Of course, she had been mad at me for a month. I feel so ridiculous and funny when I look back. This is the most dishonest thin I have ever done. I'm so sorry for my sister, Gugu and our cat.