That's a strange and interesting perspective. I guess in my younger days I could identify with that. I never really had what you'd call "functional" relationships and I often found myself falling for others. But I didn't go poly-I cheated.
Now though, N pretty much meets my needs (but I prefer to think of them as wants since I don't like the idea of being with someone out of need) in a relationship. What he can't provide I have friends and family to turn to. The one thing he can't do is provide me with female companionship and sexuality. And I have stopped thinking of that in terms of a need and come to accept it as more of an intense desire. But if it never happens again (as I am very picky when it comes to women) I will live with that and still be happy with my husband and children. I feel no drive to search for that female companionship but I do stay open to it.
I'd rather be hated for who I am than loved for who I am not.