Meaning of "getting to know", "beyond salvation"

English as a Second Language English Vocabulary, Grammar and Idioms
1

After the diagnosis, getting to know Mary was his salvation.
a marriage beyond salvation

Could you explain the parts in bold?

2

‘Getting to know someone’ means ‘having the chance/opportunity to get acquainted/familiar with someone’.

‘Beyond salvation’ means ‘that cannot be saved’.

3

Thank you.

a marriage beyond salvation = a marriage that cannot be saved ----- does not make any sense to my ear.
Could you explain it to me?

4

In other words:

A marriage that has to end.

Hope it is clear now.