Did Lincoln not want to attend the theater that night?

[LincolnMan]

An item found while reading With Malice Toward Noneby Stephen Oates- concerning the evening of April 14th:

"Between six and seven they returned to the White House for dinner. Afterward Mary complained of a headache and may have changed her mind about attending the theater now. Lincoln was a little tired himself, but said he needed to "have a laugh over the country cousin" and didn't want to go to Ford's alone. Besides, he would get no rest if he remained in the White House-visitors would pester him all evening. Seeing how much he wanted to go out, Mary relented. And anyway she'd never "felt so unwilling to be away from him."

Amazing were all the "might have beens" that made up what led to the eventual outcome of that evening. If only Mary had insisted on staying home-or if only Lincoln was simply "too tired" to go-or a dozen other little decisions that were made by them and others...