My head is spinning

I left my husband. We are still newlyweds and pregnancy with our first baby. He asked me for a paternity test and I lost it. I have never gave any indication of cheating or wanting to be with other men. I’m heartbroken and I feel terribly insulted.

UPDATE:

Sorry ladies I’ve chosen to stay anon bc it’s such a horrible thing to go through. He’s accused me of cheating on him in the past and he was super happy when we found out as we tried soooo hard to get pregnant. When it finally happened, he told his mom and the first thing that comes out of her mouth is questioning whether it was his or not. His whole family has actually questioned if it was his kid or not. I left because I couldn’t deal with it anymore and that was my last straw. Marriage is about trust and being honest. My husband clearly has no trust in me and like I said, I’ve given him no reason to not trust me. I’ve always been open and honestly with him. I just can’t believe that I thought we were building a life and a family and he doesn’t even think this kid is his