Given it was just his girlfriend, why would you expect the level of commitment that would even strain a marriage? The guy basically made himself target #1 of o

Given it was just his girlfriend, why would you expect the level of commitment that would even strain a marriage? The guy basically made himself target #1 of one of the world's super powers and he's on the run. Why would he force anyone to tag along with him, just based off some temporary notion of companionship? If they were married, with children or had some undying level of commitment, I could see some bewilderment. So far it just seems incredibly logical and reasonable she would stay behind, on both their parts.