5/365 what life lesson did you learn the hard way?

there's not just one lesson that i learned the hard way. but something pretty recent happened to me that up until now, what i did still gives me a guilt trip.. and it still shames me everytime i think about it. i i became really close friends with this person, but i became selfish and all i did was take and take in the relationship. after all the harsh words that's been said, i was "forgiven". but i can still hear the disappointment in his voice and in the tone of his letter, that i am just so ashamed of how i acted. all i wanted was a best friend, and because all i can think about is myself, i now have none.