Relationship Advice From Jennifer!

Good evening fellow Liberians ! My name is Jennifer , I am very worried ! I seriously need your advise. I am in a 3 years long relationship with a very handsome and brilliant young man, I love him to death and he is the best thing that have ever happened to me, I can never imagine my life without him.He has just graduated from the university of Liberia with summa cum laude in Law. For the past 3 years he has been jobless , just last week he received a job offer from a Law firm with a 1000 u.s dollar monthly salary. The condition of the job offer is for me to sleep one night with the manager of the company, and my fiancé has been begging me now for weeks to accept to sleep with the manager for one night, so he can be employed and marry me right away with is first salary !!! 

Please what should I do??