Never text him.

You both decide your happy here, the house is defensible, has a few days of food with other houses nearby and on hand. Why do you need to leave?
You stay at here house, boarding windows, gathering food, fucking all over her house. Due to the complete lack of condoms and protection she in variably gets pregnant. A month into the apocalypse and you're both happy, despite the longer trips to gather food.
You don't admit it but you can't last forever, though do you want to? Seems you just want to last long enough to have her give birth to your child.
Naturally this doesn't happen, after another month your **** to move from the house and for the next month your basically on the run with Milly getting increasingly pregnant. Eventually your cornered and you are killed protecting her and your child. She does live so it wasn't completely in vain. But without the quite literal bread winner she doesn't last long and your unborn child and her become just another casualty.