Definitely the first option for me.
I think the curse in the title refers to the mummy and not to those who disturb him. He, for whatever reason, is cursed to destroy what he loves most. He’s aware of it, but can’t do anything to stop it, so in that sense, it’s not intentional. It’s just what will happen. I think most of the song hints at it but, for me, it’s the last verse that confirms it:
*Long ago on the ship, she asked “Why pyramids?”
He said “Think of them as an immense invitation”
She asks “Are you cursed?” He says “I think that I’m cured”
Then he kissed her and hoped that she’d forget that question
He’s implying that the pyramids are there to attract others in so his curse can continue. Also, the very last line - he wants her to forget because he loves her and wants her to live the rest of her life happy.
And, all interpretations aside, both the song and video are gorgeous.