For me, it stays there for quite awhile, and then just slowly fades away.
That's the thing with love - it takes work to keep it burning bright. With out work and nuturing, it dies.
I am in the process of separating from and divorcing my AH... it doesn't mean that I don't love him, I just don't like him, or the life we have together, or the person he has turned me into. But I love him... and as the father of my children, I suspect I will love him for a long time...