Hello Leela, my opinion is that you have changed because you chose to, your father has stayed the same because he chose to. No matter what you do now my guess is that his perception of things will not change. All the hurt that you have already been through will be brought back up & you may find yourself back emotionally as that 16yr old girl. That little girl you carry inside that is who should be worrying & looking out for, she is the one that needs you. Be there for her. You have nothing to feel guilty about, that is part of the reason your asking right? I know that feeling, how they love to say it's your fault, you made us do it, how you think that it is the right thing to do so if you don't go through with it you will feel like a bad person all over again. It isn't true, you are not a bad person, your father is a bad father. Isn't that the truth Leela, you are not accountable for your father or his choices. You are accountable for protecting your own inner child. Yes you may forgive your father but can will never forget. I think if you sit down & ask the 16yr old girl inside wether she wants you to go back she will tell you.
Whatever you decide to do Leela, do it for you. You owe no explanation to anybody else, especially not him.
Please don't leave this forum, you will find support/laughs/experiences/advise & the occasional argument here, you will also find big hearts & Big Hugs. SABIN.