I'm in a pretty similar situation. My ex and I seem determined to ruin eachother via text wars. I have found that if you can stay quiet, they usually come to terms with things on their own and will eventually contact you. I refuse to believe that a person can live life without thinking about their child everyday, even if he's never sees her.
To me it sounds like he is trying to be a good guy by contacting you, but then he gets mixed up in his own world and fails at the good guy routine.
I'll tell you what, you're probably feeling pretty low because of the fact that having your little one is the start of a new chapter that you have to go through 'alone'. In reality though, you'll never be alone again...your baby will love you without question for the rest of your life!!!!

Don't worry, you sound very intelligent and devoted to your daughter, you're going to get through this and raise a beautiful, healthy, good person. The reward is in knowing that you've taken the best parts of yourself and the best parts of your ex and made a perfect little human being.

Congrats on your little one xxx