Nah. Not enough suffering. Sure, in the shortish term its suffering, but as its said, time heals all [emotional] wounds.
Even if you take someone beloved away, for example some loving parents, yes it will hurt, yes you will think of them, but in time, their loss will become a bearable memory. And if it happened long enough ago, even thinking about them will happen less often.
And like others have said, since its not real love and more just obsession, its possible for him to just get another obsession. If that happened he'd probably only think of nephteros when new obsession does something that reminds him of her.