How do you prioritize your commitments?

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I'm not talking about being in a committed relationship or something like that. I'm talking about commitments you make to yourself or to others, like telling someone you would be at their party and then actually sticking to that even if you don't want to, or more like keeping your promises. How do these commitments take priority? I usually give more importance to the commitment I made first. You know, that's the promise I've made and if something comes up later, no matter how tempting it is, well, it will just have to wait. Well, I like to think I'm a reliable person, if I said I would do something, then I would do it, and not leave the person who asked, hanging. I hate it when people make promises and then they don't keep them. Recently, one of my old classmates got married. She's not a very close friend of mine, but she had invited me, and I had of course agreed to be a part of her joyful day. But on the day I was supposed to go, my family decided to go for "spiderman 3". Now you must realize what a dilemma that would have been. Of course I chose my friends wedding, which I knew already wouldn't be as much fun as watching the movie with my folks, but I had made a commitment to my friend and I couldn't let her down. I can always catch the movie later right? I wouldn't like it if any of my friends did that to me. I don't like people who make false promises and I would never want to be one of them, so I stick to my commitments, and prioritize them that way. So what do you give importance to while prioritizing your commitments?