Practical advice: should I leave my partner because of a medical diagnosis?

[image: in sickness and in health, from returntowellness.co.uk]

C. writes: I started dating my girlfriend last September and we got along well. However, in November, out of the blue, she contracted a mysterious illness. Her condition is not severe, but persistent. After seeing many doctors, she was diagnosed with having a chronic illness which has neither known causes nor effective treatments. Moreover, today, she was told…