You are not stupid, you are sad.
We all need comfort purple, it's just the 'comfort' he is offering you will not comfort you in any positive way and we, us fellow women, many who have experienced men like him, know what he will actually do to you and we don't want that.
Have the police been in touch?
What do you have to do tomorrow? Do you have anyone at work who you can confide in? HR? A manager? A colleague?
How do you feel about calling Women's Aid? They are all women, like us, who will understand that you might waver about going back, and will not judge you for that but may give you some strength to stay away another day, which will soon turn into a week, and soon turn into a month.
You can do this. You need him for nothing.
Your link to your daughter could be a visit to her grave? Write her a letter? Send off a balloon? Have one of her pictures framed? Create some new links to her if you can.
Practically, you need some help. This does not make you weak, it just makes you human. Are you prepared to say you need some help to the doctor or women's aid?