I think ESTPs and INFJs are very strong types emotionally, plus they have very different ways about doing the same things. This seems to either lead to embittered fighting and disagreement or a growing friendship which has been forged in adversity.
Do you know any couples of these types? What are the potential stumbling blocks and what works best to get through them? Ultimately, in what areas do you think each person needs to grow in to make their relationship more worthwhile and enjoyable for their partner, specifically the ESTP in the couple?