Considered it as a slow action of triangle love story. If you have an experience of your first love, you would know how you are putting a lot of effort and emotion towards the entire process. Sometime you might hate yourself that you are not good enough for the others, or perhaps you would try your best to compete with the competitors to win other's heart.
Only those who has experienced it would feel it of the slow and confusion that Love sometimes makes you do crazy and stupid thing.
Let's put it this way, we have two cycles of it.
The 1st, when you start to love someone especially your first love during your younger age. Success or failure during the period, that would be the weirdest thing you have ever thought of and done.
The 2nd, when you feel lonely after the other die first (leaving you first) due to an "accident" or natural death. So there is no success or failure here, it's called how strong you are to be able to stand up alone without the other on your side.
It all depends on our decision, whether you would know the consequences, you would need to have at least prepare for what the consequences of the future for choosing your path. Is there a turning back? As in the movie, if you choose to be a vampire, there is no turning back, a very "real" situation in real life also. "When there is an option but actually not really an option". You have to prepare for what worst would come into your life if it is ever happen, even if the other is not around with you all the time.*