Unless you were actively trying for a baby, which given his reaction you were not, that has got to be the most inappropriate way, ever, to tell anyone they're going to have children.

You should be using protection to prevent pregnancy unless you both decided together you want to raise a baby together till its 21

You don't send a text message to inform a guy that you are carrying his child. You should have at least called him. Maybe he was so depressed because he found out he was going to be a father via text message.

We need more information. What did he say when he did reply? How long did it take from the picture being sent to the facebook post. For all we know he could have posted that just as she sent the picture and I didn't update till after the picture was sent. Pictures usually take longer to send then a normal message.

That is the most inappropriate way to inform ANYONE of that, much less the FATHER! Whether you were trying or not (most likely), you could have at the very least called him!