Tessellate

The first stanza is obviously about some serious argument. In the midst or the aftermath of the argument, either she complains to her friends or they were observers, so they were "sniffing" around

"Triangles are my favorite shape Three points where two lines meet." That is not a full triangle. I will interpret it as both an incomplete triangle and the 'delta' symbol. He's very sarcastic at this point (esp after talking about arguing). It's not his favorite shape and that it sucks to be in a triangle where the love is one-sided. There's also a period of change (hence the delta symbol), and he's still being sarcastic about how he loves this change

"Toe to toe, back to back, let's go" Toe to toe like in a competition, the fight is back to back. "My love it's very late." His love came late, his realization of his mistakes came late. "'Til morning comes, let's tessellate." So they argue all night long (tessellating being the repetition of something, something monotonous, and for the most part, one would gloss over as being not that important like the tessellation of tiles on the floor or the walls)

"Go alone my flower And keep my whole lovely you." So leave now while he still remembers her for what he's loved, not this distorted vile being.

"Wild green stones alone my lover And keep us on my heart." Green with envy as she leaves (for she will probably end up with the other guy in the love triangle), he still keeps what they were in his heart

"Three guns and one goes off, one's empty, one's not quick enough One burn, one red, one grin" NOTE: I don't think he says 'grin', i think it's 'green' In the love triangle, she goes off (burn) and completely burns their ties. One's empty (red), which is the other guy, who's not really even in this situation (argument). One's not quick enough (green); he's green with envy and he wasn't quick enough to secure their love.

"Search the graves while the camera spins." He searches for what's already dead while he reminisces through photos.

"Chunks of you will sink down to seals" He slowly tries to suppress his thoughts about her. "Blubber rich in mourning." He eats to forget "They'll nosh you up, yes they'll nosh the love away, but it's fair to say You will still haunt me." He's made the action of eating to forget in the form of a third person because at this point, he's not aware of what he's doing anymore. The seals are responsible for eating for him. They will slowly eat the love away, but the thought of her will always still haunt him.