Chlamydia

We’ve been together with my boyfriend for 2 weeks and a month ago I had a one night stand. I was so drunk I don’t remember anything but I apparently I didn’t use a condom because I had a weird dischard and discomfort after that. And then I found out I had chlamydia. And now my boyfriend has it too. I have no idea how to tell him, I’m so ashamed and scared. What can I do?