Chlamydia is not a big deal, easy to get rid of. if he is a good guy then just tell him you need to talk to him in privet and then let him know that it is awkward bot you was diagnosed with Chlamydia and when he has time he should get tested to prevent spreading it and save discomfort. At most it is a weeks treatment as you must know from the doctor. Again no big deal, I'm glad it was not something bigger. We all make mistakes in life so take a breath and just give him a heads up. God bless.
RE: How am I gonna tell that dude that I got diagnosed with Chlamydia. It's disgusting and this is probably the most awkward thing I've ever had to do. Plus he has a girlfriend now. Hope he got tested before they got together but still... should i tell him?