Another survivor here, I just want to say that even after 26 years of being free from an abuser, I still have days when I think maybe it wasn't just him, maybe I played a part in deserving the abuse too. You and I have been conditioned over a such a long period to believe that the man we thought we loved and trusted is perfect and that we are the ones who are damaged. We have been fed so much disinformation by them that we question our own judgement and thinking because that is exactly where they want us to be.
Do not let him know what you are planning, for he will up the anti with him being depressed and considering suicide etc, if he finds out your plans he will put a spin on how YOU are affecting him. You need to be aware he could do this, he's done it to you before, it was a regular cycle with my ex. It's a known tactic deployed by a lot of abusers when they feel they are losing control over you, you are not responsible for his mental health, he is. You are responsible for your own wellbeing and the wellbeing of your children.
I want to also just say that the police, DA supporters etc will all totally understand that the fact you don't say no to any sexual advances is completely normal in our situations, you need to not think you are consenting by being silent. You have been conditioned to be passive to avoid the consequences of not allowing them sex. I totally understand when you say you give up your body to him, I can fully identify with that, you do it to keep the peace, to keep him happy and relieved of his tensions so that it makes the next few hours/days more relaxed and less tense. I look back now and realise I was 'servicing' him on a regular basis just to keep the peace, it kept the sex side of it under my control, to you and me, that is safer than the alternative.
Over the years when I go through a low point of wondering if indeed all the abuse was my fault I have learnt to turn my thoughts to the fact that at the very least, I was in an unhappy marriage. Unhappy people in marriages split up all the time and for far less reason for leaving than I had at the time, or than you have now. Any people around you that decide to make you the baddy in this situation when you do leave him are not worth your time and effort. You will find other friend groups and you will cope. You will be amazed at how, once you leave and have had a period of peace from the constant walking on eggshells, how strong and relieved you will feel.
Please keep in contact here, 26 years ago I confided in an online forum too, not here, somewhere else. I am still friends with those people all these years later and meet up with some of them in real life. Right now, we are your support network, and we are more than happy to listen and send you virtual hugs xx