Does
I don't love you any more.
mean that my love dwindled till there was not any more of it left, focus(s)ing on the process, whereas
I don't love you any longer.
would mean that there came a day when I had to admit my love had ceased to be, focus(s)ing on that day's more or less sudden realisation rather than on the process which led (had led?) to that day?
How alive is the distinction between 'not any more / no more' and 'not any longer / no longer'?
Best Answer
I would say that there is no longer a distinction between them, where any longer was once more formal.
Any more: the two words are the traditional expression in English and may be preferable for formal writing, particularly in a negative expression when meaning “any longer”. The two adverbs are interchangeable, and you can use them in formal and informal writing.
any more (adverb) any longer I couldn't trust him any more.
The only distinction I would make is when it refers to degree: I don't love him any more than I love her. Clearly any longer is not synonymous in this case.