My partner doesn't care

Just found out a week go we are expecting baby no.2 . Completely unplanned and yes a big shock to us both. My partner said he doesn't care and is willing to leave myself and our daughter for the sake of the second baby. What do I do? He's being a little dramatic like men are but leaving your family over another baby!? Surely there are worse things and news in life? He said he wished he was dead