He's running away because he doesn't love you as much as you hope he did. He doesn't want to be with you for life. You see now with you getting pregnant, he probably felt trapped in a relationship with you. So better end it now than hurt you more. He will want to avoid you now because he knows he's hurt you. I doubt you can get back with him. You need to move on. Sorry, he doesn't love you that much. Love doesn't fade away just like that.
And as for his Bob Marley quote on his fb status, it may have nothing to do with you. From the sound of things I suspect there's another girl in the picture.
