Not all feelings can be responded to... But giving wholeheartedly without asking for anything in return cannot exist for a long time... Therefore, he chose the most extreme method to end it.
Not all feelings have to be cherished after they are lost, but the things that are truly cherished are constantly evading. Now that he realizes that he needs to cherish them, he does not intend to let them go, so he also chooses his own way to follow him.
Conception: