I really need some advice

I'm at work today, get a phone call from my ob that she wasn't able to go over my prenatal labs with me from the week before, and my urine tested positive for chlamydia. I broke down into tears. He's the only guys I've been and slept with. I'm 8 weeks pregnant. The only way I can get chlamydia is through him. Which means he has to be sleeping around?! I