Resilient faith?

In the text Oroonoko is promised freedom over and over again without any follow through or sign of commitment to that guarantee. He's constantly assured that one day he will be free and his son won't be born into slavery but there is little evidence to support this promise. Still after all the deceit Oroonoko surrenders and accepts this. I'm curious why he still takes a man who has proven himself untrustworthy at his word. It think its very possible that he uses his hope as a way to cope and avoid dealing with the situation he's trapped in. In the end we see that all the promises were truly empty and that there was never any true intent of freeing him. Even though I know these promises where a manipulation tactic I still wanted to have that hope, like Oroonoko, that there was a chance.