How would "I have a duty to hire you, but even if I don't, nobody has a right to force me to (or, at least, to punish me)" be worth the paper it's written on? How would a world where that's the case differ from one where "I have no duty to hire you, and therefore if I don't, nobody has a right to force me to", how can I tell the difference, and why should I care?
The question you are asking is, "what is morality?"
Speaking from personal experience, finding the right relationship can be HARD. I recently came across a rational take on finding relationship partners, much of which really resonated with my experiences:
http://waitbutwhy.com/2014/02/pick-life-partner.html
http://waitbutwhy.com/2014/02/pick-life-partner-part-2.html
(I'm still working my way through the Sequences, and lw has more than eight thousand articles with "relationship" in them. I'm not promising the linked articles include unique information)