Jacob Newbern popped the question to Mary Batar on Monday -- one day before he returns home as he recovers from paralysis.
Last month, he was diagnosed with a rare neurological disorder in which his body's immune system mistakenly attacks part of its nervous system.
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His doctors told "Good Morning America" that he is doing phenomenal and progressing way more than expected.
Newbern now hopes to spread awareness and help others recognize early symptoms.
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The couple has three children together, including 10-month-old twin girls and a 3-year-old daughter.