What do I do🥺 STDs

I’ve been w my bf for 2 years. Right before meeting me he had a one night stand and after we met I asked if they used protection and he said they used a condom. He also got tested later after meeting me and he was fine. It’s now 2 years later and my bf has a very tiny pimple looking lump on his dick. It’s been there for a few weeks so he’s gonna go to the doctor. He just tells me now that when he had sex w the other girl he put the tip in raw. I feel so hurt and I don’t know what to do. I’m gonna get tested soon but I’m pissed he didn’t tell me. He was my first time and my first love. What would u do!?