Husband gave me std

So I'm sitting at the doctors office with my husband because he's been complaining about his back and side . I'm thinking kidney stones ....so we're at his appointment and the doctor come in and says well your test results came back and you have  chlamydia and you need to contact all your sex partners . I'm sitting in the corner with such rage and hurt. So she looks at me and ask me am I one of his sex partners and I said  IM HIS WIFE! Well he's sitting on the bed with such a stupid look on his face and acts like he don't know how he got it and swear he's been faithful , how the hell ....I'm not cheating and I know where I've been and that's with him . Needless to say , I had a miscarriage last month....any advice on what I should do...
Been married 3 years and together 7years. Have 4 year old daughter . 
🔻I got tested with my daughter and was negative for everything . 
🔻I got tested with my second pregnancy and was negative for everything . 
🔻we couldn't have sex for a month when I started bleeding during my last pregnancy which ended in 10 weeks . 
---so long story short , it's impossible that he's had this 7 years , 4 years , 1 year or even within the last six months. Someone recently gave this to him