A Unique or Seldom Used Word

Homothumadon

There is no one else,
not another soul,
who could have married me
and made me theirs,
lived with me
and remained with me,
loved me so at the start,
and even more later,
so patiently, she
waited me out,
a long, long time after
it all began.
My love keeps her
when my madness would not.
She is accustomed to me.
She did not need to
stay with me,
yet she did.
We are one.