STD do I don’t I

I’m worried I could have clamydia (can’t spell it)

We’ve been together 5 years I didn’t get checked before we slept together but he says that he did get checked

How the hell do I say to him I think we should get tested after 5 years it’s only recently been playing on my mind

I don’t know how to go about this I’ve always used protection with other men

He wouldn’t for a minute think I’d done anything with anyone while we’ve been together which I haven’t I’ve only eyes for my man please help