It's easy to take off your clothes and have sex. People do it all the time. But opening up your soul to someone, letting them into your spirit, thoughts, fears, future, hopes, dreams.. that's being naked.
Throughout life you will meet one person who is unlike any other. You could talk to this person for hours and never get bored, you could tell them things and they won't judge you. This person is your soulmate, your best friend. Don't ever let them go.
You can't change what's done, you can't go back in time, you can't try to change the hurt feelings or mend the broken hearts. All you can do is learn from your mistakes and hope you will never regret anything as much as you do now.