It's like a mindset of some women that claim "be with a cheater that gives you love, or be with a honest straightforward guy" that sometimes can be found on FB.
It's like no matter what keeps that guy going as long as you settle your thirst, seen plenty of times in trashy "harem stories".
Then there's another example of relationships where one needs to watch a porn, check out other men/woman, etc. to get the juices flowing, but being "happy" you're receiving the effect.
Basically, no matter if men/women you're in relationship with, you're accepting the fact you're not exactly enough to keep other part fully satisfied but exist just as a less meaningful piece.
Honestly, would rather be alone than be in that kind of "relationship".
That aside, her suspicious lifespan gonna be hard to explain now and probably raise questions... sense a storm coming...