So if I ship two people, one of them will end up killing the other one.
Spoilers here:
Thomas kills Newt in tmr
Ciel basically kills Alois in black butler. I mean it was technically Claude but Ciel stabbed him.
Dipper doesn't really kill Bill but he wants to the whole series.
Light BASICALLY kills L
Like really? Four times?? C'mon. Death isn't THAT romantic.