I didn't find this mentioned in part three of the book, when mildred left the house when Beatty came with the firemen.
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Mildred bemoans the loss of the "family".
She shoved the valise in the waiting beetle, climbed in, and sat mumbling, "Poor family, poor family, oh everything gone, everything, everything gone now ...."
Montag's feelings aren't really revealed..... though he seems to be shaken to the core by her leaving.
"A great earthquake had come with fire and levelled the house and Mildred was under there somewhere and his entire life under there and he could not move."