Watson and LeslieAnne Wade, an executive at CBS Sports, were engaged in May and married in July.
Wade made the announcement of their breakup on Monday.
"My whole attention over the last several months has been on overcoming an unforeseen sickness.
Tom has been really helpful, and he has made sure that I am receiving the finest treatment available.
I owe him an enormous debt of gratitude, and I count it as a miracle that I will be completely healed.
"What Wade had to say was publicized.