One Way to End an Affair

[Achebe]

Hello 71. Some thoughts below. Thanks for posting.

The title is a spoiler. I think the poem begins nicely, so it's a good idea to keep the reader guessing as to where you are going until the end.

A candle’s dying
makes the candle
live longer, as nothing  ...nice hook for the opening. An intriguing, clever statement. 
is not by its own ceasing ...I have read and read and re-read and still can't make sense of this. It's some sort of elaborate metaphysical conceit.'Nothing is not by its own ceasing still alive' - meaning that anything is by its own ceasing still alive. what on earth does that mean? I'd suggest changing the sentence to mean something else - one example shown below.
still kept alive— ...inserting the word changes the meaning, but I'm trying to find an alternative to the original statement. see above.

not time, nor light,
nor my love for you. ...'time / light' - too many love poems have grand, cosmic words like 'time', 'light', 'life' thrown in - these are quite cliched. Moreover, I think that it's still to early to reveal where you're going with the poem, and it's better to just delete this.

Everything is red ..nice
at some point in its existence: ..this line is way too long
ecstasy consumed,
some a bit slower—

like paraphrasing
my love for you. ...again, I'd suggest waiting until the end and removing this

All things are like candles,
(I'd suggest a line here)
even heavy stones—
even my love for you. perhaps 'and' instead of 'even' in the new poem