I'm paleo and my wife is primal. I like to think it has affected our relationship positively (despite a few arguments here and there about what's ideal), but our love of nutrition and desire to live life to the fullest has brought us closer.
We didn't meet through being paleo/primal. I started CrossFit, and decided to eat this way based on the logic and results I saw in others. She finished her degree in nutrition, and understands paleo/primal to be an optimal way to eat based on her own opinions (and I'm sure my results helped too!).