((Kelly)), I am sorry you grew up with an alcoholic father that was abusive to your mother and witnessing that relationship caused you to feel so unsafe in your own home. Your father will probably never be able to apologize for how badly he behaved, not unless he spent time in AA meetings and spent time in therapy too.
YES, this can most definitely leave some deep hurts like you are sharing. It's good to learn your mother finally left him, yet that doesn't mean your mother will suddenly be all better. Trauma from this kind of abuse can take years to sort through and for some healing to take place. Yet, no one can change the damage it has caused completely.