To fall in love is not a choice. I wouldn't know what it takes, I would simply "be". Suicide is not an option. Afterall, it's always darkest just before dawn. Depression is annoying, and I don't like being annoyed. Does anyone? I found these questions pretty easy. Dwelling on this pseudo phillosophical stuff only serves to distract people from enjoying lifes' beauty. Stay carefree, see what happens.
P.S. I left an answer out. If you have to "try" to keep the one you love, then your love isn't natural. A mutual love for each other is the only way. If your love wants to go, let them go. Relationships are sometimes temporary, but true love, I believe is forever.