Well obviously, things didn't work your between your boyfriend's mother and father. =P It could be that his father is assuming things won't work out between the two of you either, and is trying to make your boyfriend aware of his "options", as far as women are concerned. Or, his father could be jealous of what you two have... a serious, loving relationship that is not dependent upon sexual favors. Some part of him, whether it be conscious or subconscious, may wish that the two of you would break up, so that he won't feel so crappy about his own situation with women.
You can't make his father change his behavior, and you certainly can't call him out on his behavior (not to his father's face, anyway... it's not your place to do so). It IS apparent, however, that your boyfriend loves you, and isn't at all eager to follow in his father's footsteps. So there's nothing to worry about. =D