Diagnosed with chlymedia

So I just got diagnosed with chlymedia and my ex boyfriend gave it to me. I’m in a new relationship and I’ve had sex with my partner plenty of times so more than likely he has it as well. I didn’t cheat on my partner this surf was contracted to me before I got with my new partner but I’m gonna tell him he needs to get tested. What is the best approach? Do you feel like he’ll break up with me after finding out even though I didn’t cheat and it was before him? 🥺 I’m scared to lose him cause he makes me so happy