I don't know why you think that because he SAID he was clear he actually was. Maybe he was just setting you up to take the fall with his "I just got tested and haven't slept with anyone".
Not that it matters. Either you are both okay or one of you is not. It will be interesting tho, if your test is clear and his is not.
And yes, you're a fool for not using a condom. Hope you've learned your lesson. Ewww.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh