Chlamydia rant/black hole

I feel like the worst person right now.

About a month ago I had sex with a guy who has been a friend for three years while he was in town.

Fast forward to now, him and I haven't really talked and I've started seeing a guy I really like. I haven't genuinely liked someone in a while and this was the only thing in my life actually going right currently.

Well yesterday I got a text from guy 1, saying he has chlamydia, and I need to get checked. I've never had an STD and if I have it I gave it to the guy I'm seeing now. When I got the text I was with the guy I'm seeing and burst into tears etc etc and told him right away, and he has done nothing but tell me it's okay, it's not a big deal, I didn't know, and it's okay.

But I feel terrible about it and it's spiraling back into depression that I was just getting out of. I understand there is worse and it's curable but I feel like a POS. I've been changing things in my life to try to be better and this hits me and I just feel like a terrible person again.