It is so easy to work your life away, forget about your family, your partner and your relationship. People putting work before family is such a common marriage problem that seems to pop up time and time again.
Its ok for a while, your partner will understand that you need to put some time and effort into your career especially if it generates a good income but as time goes on and the W word pops up again and again, even if your partner enjoys the benefits of your efforts, all patience fades and the realisation sets in that work is more important!!
I used to know a couple who spent most of their life apart. He worked nights and she worked days. She enjoyed spending the money that night shifts generated, loved new clothes, new cars and all the little luxuries a comfortable life style brings but hated her partner being tired when he was at home. They were between a rock and a hard place with him knowing that if he gave up nights bang went the luxuries and more than likely bye bye wife but if he carried on working nights and striving for promotion he was dead in the water anyway. What a choice. Needless to say they never reached a compromise, she wasnt willing to wait...