Why want to blame others when you, your ownself want to do it?
You should know the circumstances. How old are you? Do you think you are a little girl that are so silly and naive?
You blame that person for what?! You agreed to do it! You are willing to do it. That person did not force you. As you said that person asked you! And you think it before you agree... That person asked YOUR PERMISSION! So do not blame that person!
You said that person did not protect you? How to protect you? That person also in deep trouble. That person already apologize!
That person is wrong for this matter but you should not blame that person because it is you who agree to let that person do it!