It happens to everyone as they grow up. You find out who you are and what you want, and then you realize that people you’ve known forever don’t see things the way you do. So you keep the wonderful memories, but find yourself moving on.
Be with someone who meets you half way. Be with someone who brings you a glass a water when they get themselves one. Be with someone who makes sure you don’t endure bad moments by yourself. Be with someone your ex hates and your mother loves. Be with someone who alters you, not changes who you are. Spend your life with your better half, not your other half.