There must be some other reason.

I can't take no for an answer; this night was made for us; no other night will ever be just like this.

Please, dear, if there are other reasons than my own poor spirit and the little I can offer, let me know it.

If you don't care, it will be kinder to say it now! If that is the reason--even if there's some other man--let me know it now.

Tell me what it is, Sylvia!" It was true that she had not said she did not care.