I wouldn't say he went crazy,I say he just had a moment.Imagine going through something with your wife,and not knowing who the father of the child is,being pissed at your wife,her going into labor without you knowing and then finding out,she died for the sake of the child being born and not have the chance to square things away with her,I know that had to really fuck with him up,and he snapped a little,but like the ending,he faced whatever he needed to face,got a grip on himself,and became stronger.