Deployment

I just found out that my fiancé will be deploying 2 months after our first baby is born. He'll be gone for 9 months and I know this is kind of what we signed up for but nothing worries me more than how will our be without his dad to bond with him for the first year of his life. And to make matters worse my fiancé is beyond paranoid and scared that I'll leave him or cheat on him like his ex wife did on his last deployment.