How can the eardrum get damaged?

Over time, an injured eardrum can heal but the membrane usually has a scar and hearing may be affected.You might consider having a tympanogram. Ear drums can tear due to fluids in the ear and when...

in the middle ear

No. Something is either damaged or it isn't.

It's a thin piece of skin that vibrates when someone or something talks or makes a sound. It can brake very easily so loud noises and pointy objects could brake your eardrum.

The eardrum sends sounds entering the ear canal through the air as sound pressure variations to the cochlea of the inner ear.