How would I have syphilis? If I have only had sex with on woman and I took her virginity. What does that mean?

Have her tested. If you have syphilis and have only had sex with one woman, it could only have come from her. Either you were fooled about her virginity and she already had it or else someone else gave it to her since you started having sex with her. My sympathies.
Is this a quiz? Need evaluation - and more details to be fair to you.