My wife (we are separated but I for some reason don't want a divorce) is INFP. The marriage was a disaster but 3 years on, she is back to being my best friend. INFP/ENFP doesn't work when there are practicalities to deal with and bills to pay. She is my best friend, mother of my children, and an amazing woman in many ways. However, we know that getting back together again would be a fantastic disaster. I believe NFP/NFP is not a good combination.
My last girlfriend is INFJ I believe. Possibly INTJ. Sometimes she seemed T, sometimes F. Strong J. I don't thing J/P is really a good combination. If you are a P, the J won't 'get' your need to see possibilities.
I am starting to wonder if it would be better for me (ENFP) not to have a proper relationship, but friends who are lovers too. (I hate the terms 'Friend with Benefits' and 'F Buddy'.) I just don't see how other types could tolerate ENFP, and I'm not sure how I could tolerate other types.
Having said that (I've said it before on here) I do seem to be attracted to INFJ girls.