1995 Buick Riviera

Engine Mechanical problem
1995 Buick Riviera 6 cyl Automatic

i recieved this car as a gift after the motor had been rebuilt. After leaving work, my oil light came on. I added, more oil and the oil was not out. So very concerned I asked a co worker and he informed me to add more oil, I informed him that the oil was in the xxxxx on the dipstick. He informed me that if the light is still on to add more, against my better judgement I did. The light did not go out. I took the car to a mechanic and was told the oil pump had went out but the price quoted was too steep for my purse. My neighbor, a mechanic informed my fiance that with there being metal in the oil, the engine would have to be replaced. Something about the bearings. Today my fiance called after talking to a coworker that also works on cars and told him that a new engine is not needed. Drain the oil, and replace the oil pump and all will be fine since the bearings are in the oil pump, replacing it will remendy the problem which mechanic should I listen to?