I think love is one of those things that if you overanalyze it or hold your expectations too high, it won't exist for long. Like they say, there's a fine line between love and hate.
I know it exists but like it's been said in the above posts, it's on a case by case basis. What a lot of people don't understand is, all relationships have their ups and downs and they will hit a stale patch on occasion. That's life and circumstances. Someone worth being in a relationship with will stick with you in the hard times, someone who probably isn't on the same level as you, will bail at the first sign of boredom or other issues.
To me, true love is unconditional. It's forgiving, it's accepting, it's understanding, it's patient, it's not superficial, it's not materialistic and it's trusting. When you love someone, you won't notice their flaws or stress over their imperfections (be it physical or mental), you will just love them as a whole and not in a selective order.
This all probably sounds unrealistic, but it only sounds unrealistic when you have to force yourself to do all of those things. When it happens naturally, you won't even notice you are giving/receiving all of those things, all the time.
I know love exists... and I also know what it's like to have your heart torn out. Grief is the worst kind of pain. Sometimes I think humans are the unluckiest species in the world when it comes to emotions and thinking in general.
