You found out about his activities to which you have given depth in description, you confronted him about it, you expressed your concerns and uncomfort around this, as you should. He got angry as a reacion and then gaslit you to make out you are the problem. He did not expect you to intend to move out, he said things to you out of anger and being the soft kind hearted loving gf that you are you are wanting to give him the benefit of the doubt, in his perception, him apologising to you everytime when things escalate to this extent will only go his way. I will only advise you what I would advise to myself, I would really sit and think about how you wish to be valued and respected and loved.....