What's it like to be in a great relationship and lose a twin baby?

This is what my friend underwent with her fiance. Their baby girl was born premature at 7 months via C-section.

They were going to be first time parents of a twin boy and girl. The baby boy died but the girl survived and is now 5 months, though smaller than usual.

What's it like to have the best relationship, everything full of happiness but you lose a twin baby?

What's it like to be in a great relationship and lose a twin baby?
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