Give him this word for word "I dare you to gather a sampling of military spouses and significant others and ask this question. Watch how fast you are eaten alive. Can stress pull apart a relationship? Can weaker people falter? Absolutely. However, an outstanding majority of military significant others will stick by, thick or thin, coma, loss of limbs, PTSD, etc etc. We go for months with out sex, worrying every single day if our soldier will come back to us alive, and if he comes back alive, will he be in one piece mentally and physically? We go for weeks with out contact along with those months with out sex, yet somehow we keep our relationships alive, we stand true, don't cheat, don't give up. Because we have the most important thing of all: Love. It is that love that gives us the strength not to give into temptation to take the easy road out when the going gets tough.
While military significant others are not alone in this keeping of the faith and many women do it every day, they are a large, easily recognizable group that is representative that the strength humanity has in the face of a challenge or adversity like this. If someone can walk away from a loved one in that situation, then there was never true, deep, abiding love to begin with and the person is better off for the loss when they return from the coma."