He probably hopes that if he ignores it long enough that it will "just go away". Meaning you will give up and submit yourself to whatever him and his mother want.
Please remember that before you meet him you were fine, whole and were able to be happy. That's what my mother said to herself when my father left us. It will feel really bad and even numbing. But it's better to leave now, especially when you guys don't have any kids and while being financially independent. Whatever the future holds for you I hope you'll find something better. Maybe you won't even care about marriage and will be happy with just being a couple with whoever is going to be your love. Who knows...
Anyway... Your husband is a muppet. I wish you all the best. Eat something nice. Hug your mom.