Ruairidh Wynne-McHardy writes:

We are all attached to the things that we create. From our relationships, to our work, to trivial things like the way we decorate our home — we don’t like to destroy things that we have put effort into.

That’s why it’s even more important to delete your code.

Never be afraid to throw away code that’s not working when the requirements change. You know more about the reguirements now than you did when you first wrote the code. Be brave.