Well, thank you for you candidness.
A rough separation is rough on everyone involved (you know this). The reason I asked is that this is when you can directly influence how easy or difficult co-parenting with him is going to be. He's pretty much responsible only for his actions - not yours. If you can - and believe me you're not the only one who's gone through something like this! - find it in yourself to do just about whatever it takes to be the "good guy" in this, your daughter will thank you, Dad may (eventually) wise up enough to thank you and..maybe more importantly, you'll know that you've done everything in your power to make sure your little girl grows up into a well-adjusted, confident, secure young lady.
I know it's hard. Please believe me - I do know. But you have to try as much as you can to put your hurt and your heartbreak to one side and focus on what's best for this little girl.
And what's best for her is her family - all of you.