My cat I can't believe this anymore :(?

This is long I had 2 cats one of my cats named bunny was 18 years old we had to put him down on June 10th 2010 he got relle sick and old I love him with all my heart I had him since I was a littl kid it was sooo hard on me I couldn't get ovr the loss but luckily I had my other cat Tucker he's 3 yrs old but last night he got ran ovr my a car, I heard a car stop short and speed away I knew somethig was wrong I yelled Tucker for 10 mins he didn't come and usually does I started freaking out then a car pulled up and a girl got out I yelled down and asked what she was looking at she said there were 2 cats I ran outside and there was my cat Tucker and another cat laying there I looked at my cat Tucker he was still breathing and I got my parents he was laying in a pool of his blood and started gaspig for air. I feel like it's my fault he was only 3 yrs old!!! I feel like I could of done something It felt so unreal we buried him today Iost 2 cats in a matter of 18 days Im depressed and it's all my fault I feel I love him and want him back I can't get the image out of my head :(