Sound Threatening?

I confronted my husband about his EA 2 days ago. In a nutshell he tried to gaslight me and say it was not as serious as I am making it out to be and then confessed he loved her. I said if he wants to work on our marriage his relationship with her has to end. He said I am putting him in a position to hurt someone either way and I said he put himself there. I said I deserved better and he laughed. He waited 4 hrs then said he gave it deep thought and he will call the OW one last time and end it. I know he was waiting for me to say how grateful I was he chose me but instead I said I don't envy him that conversation cause she isn't gonna be happy. He said no she isn't and how she has no one and has threatened suicide if he (my hub) leaves her. He agreed to go to marriage counseling but got a dose of reality shock I think and told me in a very sinister tone "If you **** this up for me I will never forgive you." I asked how I could do that and he said by lyin g and making him look bad to the counselor and I said I was just going to tell my truth and opinion. He then repeated himself slowly. If you **** this up for me I will never forgive you. I got chills.
I am feeling ready to file for divorce and at this time and not even thinking counseling is going to do much good except maybe to have a mediator there when I say I am going to file.
Whats your opinion on what the hell he might mean?

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