and "checking in" with affirming words that we're still you're #1. Not sure WHY we need to hear words- we just do.
funny- since posting this, while driving in my car & what not, pondered on this some more. (The "why" we need the words.) I'm thinking that because we are Ne primary and Fi secondary, our intuition is CONSTANTLY in motion. Moving, changing, shifting and co-mingling with our feelings as we try to sort out what is going on at any given moment. Perhaps the more thinking types hear once, "I love you. You are my #1." and they register that in their minds and that's that. It's concrete fact unless something factually changes that.
To an ENFP, we constantly internally challenge fact. Because we naturally test it against our intuition and how we are feeling about it at any given moment. So we doubt everything around us constantly .... or see different or new possibilities for them. And with matters of love, this security of knowing we are "good" with our significant other can just never be a hard fact that is stored like a chip in our brain. It's so important to us (our love relationship), it is running through the spin cycle of our Ne. So we NEED to HEAR the definitive words on a regular basis. Or some other definitive cue that we're "still good."
We are wired this way- period. That's how we're wired. If you are not Ne and this seems completely foreign- don't be afraid! It's no big deal. But knowing this and making sure you are constant in meeting this need for the one near and dear to you who is Ne primary- will keep things smooth for you both. And lovely!

(and btw- I welcome any challenge to my ideas on this cuz seriously, what the hell do I know??? hahaha)
-Ty
adding after the fact: this would make a great blog post. (ie. ways to be affirming to your ENFP besides taking her on trips to the caribbean and wining and dining her. Not that there's anything wrong with THOSE things. haha)