I know you have needs, but you just had a daughter seven months ago.
Your wife has been involved in bonding with and taking care of your new baby. Unfortunately, that takes some of the focus off you and your son for a while.
This was a time she probably could have used some extra support and understanding. This was not the time to get hung up on your needs and run away overseas for a year when she needed you the most.
In her eyes, she may be trying to protect herself, because she thinks you walked away first.