Its pretty obvious in the og story he clearly only lover Adeleine bc she reminded him of Em, strongly. And even if that wasnt the case, theres definitely not a 100% chance that she'll die and give birth to a stillborn bc Dylan isnt emily and shes a heck of a lot healthier than Emily. sooo just marry him? And even if Adeleine comes around, theres no 100% chance he'll fall in love because Emily isnt his wife, she isnt dead and he doesn't get super depressed bc of it. Sooo why doesn't she just use common sense?