If is worth it, let me work it

I was wondering... Is it possible falling in love without breaking your heart? Or breaking your heart is just a big part of the process? And if you don't want to break your heart? You just don't fall in love? Is that even possible? My point is if we all know that someday we will get hurt so why we keep doing it? Is it worth it? Or we all are a bunch of sadomasochists?