25 years just gone… 😭💔

My husband. (Stbx) told me 6 weeks ago he filed for divorce. Everything was great. Better than normal to be honest. Sex life was perfect too. No arguing. Having fun together, going out together. Cooking together. Watching tv shows etc. together. Then after 25years. He hits me with “I filed for divorce” no explanation, nothing at all from him.
I’m grieving so bad. I’m not even trying to fix it. As I don’t know why. He won’t talk or anything. I’m not going to start screaming and shouting. My head it all over he place.
He keeps trying to have sex with me. Saying well we can at least help each other out. If you need/want sex then I’ll help you and if I do then you can help me. 😳🤯😤🤬😱 I’m honestly in so much shock. My reaction inside was raging. But my reply to him was “absolutely not. Thank you” and walked off. I’m not a toy to be used and abused whilst he can happily sit there, happy with no emotion regarding our marriage ending. Whilst I’m in bed or the shower breaking down. I’m literally so broken I don’t know what to do.
Sorry I need to rant and didn’t know where. I don’t want to burden any family/friends. As I don’t want my family falling out with him as they get on amazing.
I’m just so alone and broken. The kids (teenagers) don’t even know. I’m trying to act like everything is fine. So, so sorry for the rambling.