I am going to go against the grain here.
I am a woman and I have been the abuser. Although, depending on how you look at it, depends whether I meet the criteria to have emotionally abused my partner.
My behaviour was totally unacceptable, but none of it was intentional. I let things build up and up and never talked about things rationally, the output for this would then be my poor partner, and it nearly ruined our relationship.
When I realised how bad I had been I sought help immediately and was (and still am) devastated that I became that person.
Since the day I sought help, I have not behaved in the same manner again. Occasionally I have felt the anger again, but my natural reaction is totally different now. Whether that is because my behaviour was never, not once, intentional, or because I truly saw what I had become and sought help, I don't know.
So in answer to your question- I would want to see changes immediately, I could forgive minor slip ups as long as he was aware of his behaviour when pointed out and stopped it immediately. It's a long road ahead and he will only stop if he truly realises the person he is and wants to change.