boyfriend gave me chlamydia!!!

My emotions are everywhere right now. My boyfriend and I have been together for almost 3 years. On Thursday I found out my IUD had rejected so I had to get it removed. My doctor did a swab for gonorrhea and chlamydia just for a standard procedure. Since I had the IUD my boyfriend didn’t wear condoms. He is the only person I have been sexually active with for the past few years. I did find text messages to another girl on his phone and when I asked about them/her he told me they only talked but never actually met up. I feel so disgusting with myself, I’m hurt, I’m too embarrassed to talk to any of my friends or family and I just feel stuck. I don’t know how to bring it up with him because I know he’s just going to deny it. Has anyone else been through something like this, or have experiences with chlamydia???