C. S. Lewis said "Love is not an affectionate feeling, but a steady wish for the loved person's ultimate good as far as it can be obtained."
Words to live by, not just romantic relationships but also one to bear in mind for friendships. Don't waste precious time on those who don't deserve it.
You can say sorry a million times, say I love you as much as you want, say whatever you want, whenever you want. But if you're not going to prove that the things you say are true, then don't say anything at all. Because if you can't show it, your words don't mean a thing.