Relationships between ENTPs and Si-dominant types simply can't work. That been said, differently from what occurs in relation to ISTJs, there is a superficial connection between ENTPs and ISFJs. The communication works just enough to make the beggining of a relationship possible. Everything beyond that is a problem.
The ENTP likes the demonstrations of affection and that the ISFJ take care of the annoying mundane tasks of every day life. But soon this affection becomes invasive and smothers the ENTP. The ISFJ can't like the ENTP for what he is, she likes some wicked idealization of the ENTP after her improvements. But the ISFJ wants to change the very core of the ENTP. Things that can't be changed. Things that define what he is. The ISFJ wants the ENTP to be "normal" - more like every one else. She wants him to settle for ordinary life: to marry, have a stable job at the Burocratic Office, Department of Tedium, buy a house, have a pair of kids [preferably a boy and a girl], change cars every two years and, if lucky, go to the movies or "their favorite" restaurant by the weekend, maybe even travel on summer vacations.
The ENTP doesn't like the ISFJ the way she is either. He wanted the ISTJ to be more open-minded, adventurous. That the ISFJ could think by her own, and not through common sense or tradition. That she was more adaptable.
The ENTP knows better that there is no real connection. That the ISFJ can't understand him. That the ISFJ is not intelectually stimulating. The ENTP should stop being stupid and find an INFJ.