Being her friend does not mean asking her out on a date.
At least not yet.
Think about it, and maybe you're different than I was, but asking out on a date only happened after some friendly groundwork had been laid.
You need to try to get inside her mind and understand where it is that she is coming from. If she wants her heart to be won all over again, you're at square one.
At this point, I'd let her do the asking.
Being a friend means that you are available if she calls. If she asks for help, you provide it. If she initiates a conversation, you participate.
Her agreeing to a date unfortunately did NOT mean you were starting over. What you have to remember here is, if she didn't say it directly you can't assume it. No assumptions and no expectations. Anything else will frustrate and disappoint you.
If she doesn't call, don't call her. Don't talk about the relationship, either about YOUR expectations or HERS. In her mind the past is now a bad thing, regardless of whether it really was or not. And telling her you want your marriage back could possibly be a frightening thing to her, because SHE DOES NOT! She might be convinced to take on a "new" marriage where the two of you have made changes, but she has no interest in what you had before.
Don't overcomplicate this. And whatever you do, this is NOT a time to indulge your need for validation, approval, or love. You're on the outs, whether you deserve it or not.
Read this letter. I think it explains better what I'm trying to suggest to you Jonzy.