Really torn on that issue.
On the one hand mature people, especially christians and especially lovers should be capable of solving the conflicts that will inevitably occure in a relationship or marriage in a peaceful and loving way that meets the interestes of both.
My grand parents were married for more than 70 years (they both lived long), they were happy and in love until my grandfather died at age 97, and I don't remember them quarrelling much. They told me stories of "fights" they had that were rather funny and resolved quickly, nothing that would really cause negative emotions.
From my own experience it seems to me that good conflict solving skills in a relationship will give both a sense of safety and closeness. But it's also important not to avoid a conflict, but to solve it in a loving way without fighting, i.e. without a sense of aggression on either side, and with the wellbeing of the other in mind rather than "winning".
On the other hand, the people we love most are the ones that are in the position to push our buttons. Personally I'm not the best example of sanity, my buttons are pushed way too easily. A love story without fighting wouldn't feel alive and real to me. I'd start fights even if there are no relevant conflicts. That's how I lost all my previous relationships. But it seems that to me love combined with anger is more intense than just love, and serves my need to push people away, and thus some part of me needs that like a drug. Not to mention the awesome intense and emotionally charged sex you can have during or right after a prolonged fight.
Can people really feel happy and fulfilled without all those emotional ups and downs? My rational mind says yes and that's what it should be, but I know that y heart is far from being like that.