I can relate to a lot of what you shared, Bungled. I also wanted to get back to the good times and accepting that wasn't going to come back was hard. Part of what helped me here learning about the idealization phase and that what she said and did during that phase really wasn't all that real to begin with. But, damn, didn't it seem real and it was intoxicating.
One song kinda helped me see how I felt about that idealization phase and how I was begging for it - U2's "Even Better Than The Real Thing".
https://www.youtube.com/watch?v=Yrch66gdjjkGive me one more chance
And you'll be satisfied
Give me two more chances
You won't be denied
Well my heart is where it's always been
My head is somewhere in between
Give me one more chance
Let me be your lover tonight
You're the real thing
Yeah the real thing
You're the real thing
Even better than the real thing
Give me one last chance
And I'm gonna make you sing
Give me half a chance
To ride on the waves that you bring
You're honey child to a swarm of bees
Gonna blow right through you like a breeze
Give me one last dance
We'll slide down the surface of things
You're the real thing
Yeah the real thing
You're the real thing
Even better than the real thing
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So, yeah, that pretty much describes how I begged to get back to that idealization phase. But then I started to understand that if the love is real, you shouldn't have to beg for it or chase it. Turns out that the illusion of perfect, soul-mate type love is not even better than the real thing.
I was also overwhelmed with a feeling of guilt and failure immediately after the break up because she said that it was all my fault and I believed it. But the idea that only one person is responsible for the failures in a relationship is just illogical and ridiculous. It was logic that got me through that. I've been telling the details of how I started to put some of her assertions that I was all bad to the test in my own multi-part story I've been sharing on these boards so I won't detail it here. The short version is that when I started using logic and evidence in my conversations with her, her narrative crumbled and she backtracked and retreated.
I'm proud of you for taking the steps you are taking to distance yourself from her and all the struggle of the relationship. It is a difficult road you are on but know that you are making a good decision for yourself and your daughter. Blessings to you!