Please please don't feel guilt. Don't let HIM make you feel guilt. He shouldn't say a damn thing to you that has any anger in it- but he is. He's mad at YOU for being upset?!
Don't let him play you that way. Know that you are not failing your daughter in any way!! He is/did. It's so, so sad that she won't have a mom/dad household, but you know what? You have 2 options now- an unhappy, united household (speaking from experience, NOT fun for kids) or a new reality of 2 households without the tension. You can't go back in time, you have to move forward with the new status quo- that HE created.
She WILL be okay. You will show her how to be a woman with strength, with self respect. That lesson is so important for girls. When she is old enough to understand, she will respect you for it and respect herself more as a young woman.
(And you WILL be okay, too. One foot in front of the other, one day at a time)