Well, it's not your fault, you know. how many strays can we save? As long as we can care for them, even for a short while, it's all worth it. Most probably they are safe somewhere already.
In my case, I got a mummy cat that gave birth to 3 beautiful babies at where I am working, in Joo Chiat Complex. Everyday she will come to my shop and I will feed her. Then someone moved her babies and she frantically search for them. I felt so sad, but luckily she found them in a box, and took them away. And she disappeared for a few days. And I thought she won't come back anymore. But she did. And I will feed her as long as she comes.

. I will post her photos here later.