I read this as part of The Time Traveller’s Almanac, edited by Ann and Jeff VanderMeer.
This is a time travel based on real science – the concept of the Dirac Sea. The essential notion being that one can only ever go back in time, never forward. And therein lies the trap. Although I’m not going to say more than that.
It is well written and vivid, which drew me in, and as events unfolded – or evidence became apparent – sympathy for the main character grew.
This is ultimately quite a sad story, but it also shows someone who is living life to the max – in so far as they are able.