You are both going through a very hard time. Cancer is no joke, and I can definately understand your Husbands lack of affection. Chemo and therapy for cancer are very hard on the body and mind. You are very kind to care for him during this time, and I think if you give him time to recover he will gradually come back into it. How long has he been off of chemo?View Thread
Remember that infidelity goes both ways. Both genders can participate, not only men (just basing off what I have read in the replys so far).
Regardless, I hold any relationship I am in as a sacred entity. Married or not, cheating is not acceptable and no matter the reason, is grounds for termination.
You dont just give up your body like that and expect your formal partner to look the other way.