I don't particularly believe all love is doomed. But I guess, one is usually kinda suffering from some aborted love affair or association, rather than being at the peak of one. I think it's fairly obvious that a lot more suffering goes on in the name of love than the little happiness you can squeeze out of it.
Nick CaveI look at you and you look at me and deep in our hearts know it That you weren't much of a muse, but then I weren't much of a poet
Nick Cave