Are you sold on the idea of emotional purity because you fear being hurt? Or because you've been hurt in the past and there is no way you're going to let that happen to you again?
Although I believe, in the long run, practicing emotional purity will save you heartache, should this be the number one reason people strive for it in their life? I don't think so.
We don't obey and follow God's call to just avoid pain or hurt. At times God will use our deepest hurts and pain to draw us closer to Him. He will make Himself more alive in our hearts when we're "walking through the valley of the shadow of death".
When I think of some of the greatest lessons I've learned in my walk with God, they haven't come from the happy, rosy moments of life, but the heart breaking and painful moments. It's in times like these that we come face to face with out own humanity, our own sin, and our own fragility.
So don't cling to the concept of emotional purity to just avoid pain. Cling to the concept of purity for the glory of God!