Don't attach your feelings to someone else's heart.

Always remind yourself, “Don’t attach your feelings to someone else’s heart. If someone changes one day, you won’t be disappointed.” Keeping your heart strong, being able to be alone, and being as happy or sad as possible with other people’s opinions of you is the main way to maintain peace of mind. Just remember two things: first, we can’t make everyone like us. Second, people who like us may one day change to dislike us. People who dislike us may one day see our good points as well. It’s best to keep our hearts as our own refuge.