Don't leave her, even when she gets moody. Because she's too proud to admit how much she needs you, how much your words mean to her. Especially at 3am behind closed doors.
Choose to stay, even when she tells you to go. Because she's afraid of opening up to people, scared of trusting only to end up being used. Stay. Because she's terrified of being alone.
And when you tell her you love her, mean it. Because you have the power to shatter her, to break her into a million fragile pieces. So don't lie to her. Ever.