He wasn't being nice because he wanted to comfort you, he's an abuser, your pain is an opportunity. Being nice to you is bait, you're supposed to bite and he'd reel you in and then cycle of shit would start again and deep down you know this. The cycle of abuse only stops when you break it, by getting out and staying out.
You're grieving and your grieving for a child, I can not fathom or would I ever want to imagine, what hell that must be. You don't want to go back, you want an escape from the utter despair that is losing a child. You want to feel loved and wanted, like she loved and wanted you but even temporarily, this poor excuse for a man can not do that.
He raped you, he beat you and cheated on you, isn't the mother of your daughter worth more than that? Honour your daughter by being kind to her mother and the only true way of doing that, is being the best person you can and that can not happen if you are still being abused.
Your worth more, I know it, your daughter knew it and now it's time you caught up.
If you have no one in RL to support you, stay with us.