Why do i feel this way.

Jessica
16 weeks pregnant today. And found out its a girl. I should be so happy and excited. Should be picking out bedding and buying clothes. But instead my three year old and I had to move out and away from the person who was suppose to love us. My wife instead slept with a nineteen year old. I'm so sad. I feel like my life is just so done. My son is so confused and wondering where mommy is. 6 years of so much love. Nothing is helping me cope