Always remember that you are the only one who can fulfil the promise of being there for you, always. People can make promises and mean them. But sometimes they change their minds. Sometimes they forget their promises. Sometimes death takes them away. Sometimes they move away. Sometimes they meet someone else they like more than you. Sometimes things happen and that's how it is.
So please remember to love yourself a little more. I don't mean not to love anyone else. But don't lose yourself while in love, as tempting as it is. Don't give in all the time till your standards and values disappear. Don't change for the sake of someone else. Sometimes no matter how much you change, they wouldn't care regardless. Someday you'll meet someone who thinks you are perfect as you are, no matter how neurotic, how fucked up.

Life is an adventure. Always remember that.