This is not my work. All credit goes to J-Roc on Yahoo Answers.
pag-ibig is waking up every morning and that person is the first thing on your mind. It's when you would do anything to see them smile and it breaks your puso so much to see them cry that you cry with them. It's when you want them to be happy even if it's not with you. pag-ibig is when every song you hear reminds you of them and every place you see makes you think of somewhere you've been with them. It's knowing that you want to spend every minuto of every oras of every araw of every taon for the rest of your life trying to make that person understand exactly how much you care. It's when you do little things just because, it's being sad when you have to go. pag-ibig is when you know that you can't wait till you get to see that person again. It's knowing that it's madami than just a physical attraction, but something so much deeper. It's when you don't even notice other people in "that" way cause you're so focused on that person. It's accepting them "as is", faults and all. It's when they have little quirks that make you smile and its when you just can't get enough of them.
pag-ibig is knowing that you can't explain how you feel in words so you spend every minuto just trying to express it with actions. It's madami than making out or sex, it's those moments just holding each other and knowing that that's enough. It's the little inside jokes and secrets that always make you smile. It's wanting to do something special when they're down. It's wanting all of your mga kaibigan to know them cause you're so happy to be with them. It's when you're proud of them and support them in everything they do cause you believe in them without a doubt. It's something you can't express in words but in actions. It's knowing that you're truly HAPPY cause you mean the world to someone and they mean the world to you