Need Reassurance

I had to put my beloved cat, Peekaboo, to sleep on Tuesday. She had a tumor growing on her side which I believe was growing into her lungs making it hard for her to breathe. Four years ago the vet excised it but it grew back over the years. I knew she was sick and that I'd probably have to do it someday, but that doesn't give me any consolation. She was having a horrible time breathing, but rather than put her through tests to see if it was the cancer or some other kind of problem I chose to put her to sleep. She had also lost a lot of weight and was not eating.

She was full grown when I found her one day hiding under my car and she was the best cat I ever owned. So gentle, so loving....she was my best friend. We had thirteen years and two days together, but in my mind that wasn't enough. I want her back healthy and whole again but I know that will never be. I guess I'm just looking for reassurance that I did the right thing because I feel so bad about having to do it.

R.I.P Peekaboo - I loved you with all my heart.