I was driving my 2001 mitsubishi galant and the timing belt broke when i was driving it and the book for my car said that when the timing belt broke that you have to replace the piston and the valves.

Sadly this is an interference engine, meaning that when the timing belt breaks, the piston tops most likely will have hit a few valves and bent or broken them.

I'd recommend not turning over the engine any more, and taking the cylinder head off. You will then be able to assess the damage by looking at its underside for bent or broken valves. The big hope is that no pistons are holed, in which case you just need an exchange or repaired cylinder head assembly, timing belt and head gasket etc.

If any pistons are holed or cracked, they will need replacing, and when you do that you need new rings, and possibly honing of the bores.It may also lead to replacement of the big end bearings. In some cars this can be done without removing the engine, I do not have experience with your model.

For this age car you have an economic decision to make before going ahead. All the best.