Relationship and no condoms

My boyfriend and I are both clean. Been together over a year. Strictly monogamous. He’s never been with anyone. I was with no one but been tested. Do we still need to get STD checking annually? Or because we’re only with each other are we safe? (Before anyone says I don’t know what my boyfriend is doing he’d never cheat. He doesn’t even have the opportunity as he’s with me practically 24/7)