It's his decision like it just makes everything harder
Try not to stress yourself as much as possible. I know that sounds beyond possible but focus more on your little one and nothing else . I am having my first due in November and the first 6 months have been depressing too . Now all I focus on is what I want for my son, what will he be like, what will I be like as a mom, ect. It's really s h i t t y of your fiancé to leave at such a pivitol moment in your life, but you have to be strong for your little one. Chin up :) , where there is a will , there is a way