The stars, who were together for a decade before tying the knot in October (2019), tried to conceive for many years with little success before welcoming their daughter George in February, 2018, and the actress admits "The Walking Dead" star struggled to explain his feelings when presented with the tragic news.
"We had multiple miscarriages, and every time his reaction was very, very different," she tells InStyle. "There's a wonderful book that was given to me by a friend and it's from a man's perspective of dealing with infertility.
"Even though Jeffrey wasn't necessarily able to articulate his feelings the first time it happened, I was able to read a book of someone else's account."
The helpful book inspired Hilarie to write her own account of her experiences with miscarriage in The Rural Diaries, which will be published in March (2020).
"It helped me understand what he was going through, so if our book can do the same thing for people, then that's the whole reason for putting it out there in the universe," she shares.