Then just marry without expectations of each other. Focus on the advantages: both of you can focus on career, and during holidays can spent quality time with each other. During LDR days just a morning/night text if nothing interesting to talk about, and try to call at least once a week to talk about everything that has happened the past week (family, friends, work, hobby, TV, can sex chat if interested also)

Just make sure when you both say focus on career, really focus on career, don't gatal gatal go flirt with other people or accept flirting from others.

Just break up and move on.