Why is my borough SUDDENLY is forcing me to pay for sidewalk repair in front of my house?

The sidewalk was not as damaged years ago as it is now. The laws that govern such issues are known as public safety. Your side walk is that of public domain. The rights of the borough is that you only deed the land where your house is located. The actual land is the USA and then the State and then the city or borough. They only allow you to live there.