Self acceptance isn't all about being nice and good and perfect. How many emotional abusers put the pressure on a person to be perfect, to be an impossible ideal? They may dole out love, conditionally, the conditions being that a person must be perfect. They zoom in on the person's perceived faults or "failings", catastrophise them until the person who is being abused believes that he/she is unworthy, no good, somehow "bad". They then learn to think in very black and white terms, just like their abuser. They try to appease, and be perfect, or they may rebel, and show only their "negative" qualities and go on to abuse others. The victims, viewing life in this black and white way, will consistently search for the perfect relationship, for an impossible ideal. They may meet more abusers and be taken in by their charm, believing this is the perfect relationship, because their abuser charms them, compliments them, gives them praise and because their self esteem is so low they lap it up.
Part of the secret of healing is to let go of these perfect ideals, to accept that life is not perfect, that the perfect relationship doesn't exist, to accept imperfection within oneself. When a person lets go of the search for perfection, he/she is free to he his/herself, accepting hin/herself just as he/she is, knowing that others are not perfect and learning to take their place as an EQAUL with others in society. True self esteem involves feeling and knowing one is equal. When this is achieved, a person no longer has to strive, and will no longer feel the need to be a people pleaser, to try to be perfect to be accepted. There is no need. The person knows that she is okay just as she is. She/he is allowed to make mistakes, to forgive her/himself, and to move forward with understanding and wisdom. It's okay to make mistakes, to get it wrong sometimes.
There is a vast difference between guilt and remorse. Guilt cripples. It prevents a person from moving forward, trapping them in the past, engulfing them, making them angry, lonely and bitter, with big feelings of unworthiness. Remorse is different. A person accepts that they have done wrong, feels the pain of the wrong doing, attempts to rectify the situation, and if they can't learns about themselves, grows in understanding and wisdom, learns from the mistake, does their best to learn from it, owns it, takes full responsibility for ir, and uses the lessons they have learnt to grow emotionally, and move forward. They allow themselves to heal, and know that in order to heal they have to love and accept themselves, faults and all.
You are the type of person who feels remorse, and therefore you will grow and learn. Your ex did not feel remorse. He may not even have felt guilt. Who knows? Those who are incapable of feeling remorse have psychopathic tendencies and do not change. They remain trapped in cycles of negativity and fester. You're not like that.
You need to forgive yourself for what you called emotional abuse on your sister. Self forgiveness is difficult, but if you can remember that all people sometimes fail, that no one can be a perfect ideal, and that you know these actions are wrong, and you know that you should not minimise them, and that you have learnt from them, that you can own responsiblity and know that you wouldn't repeat this action, then you can safely say that you have experienced genuine remorse and it's now time to let go and forgive yourself. To cling onto this incident would only turn the emotion into crippling guilt and self hatred. Please forgive yourself.
Every day takes you one step further away from the past. You're doing great hun!