It is lingering and for that reason, perfect trust is much more difficult to achieve. What is most difficult is when that feeling of love or trust is destroyed. A broken heart can heal, but a broken trust remains broken forever. Love remains in your heart in some form, even when perfect love is far away. There is always the knowledge that the moments of perfection, of the unconditional give and take so necessary for love, can be achieved again, even if only fleetingly.
Love is like water, clear and flowing.
Draw your finger through the water, and you leave a wake, but it soon closes in and the love is clear and smooth and flowing towards perfection again. But a broken trust can never be mended. A friend who lets it slip at work that you are pagan causes irreparable damage. No matter what the end result, no matter how deeply and truly regretful your friend is, that trust has been broken. If love is the water, trust is the bowl.