Relationships

So, in about the middle of September, I started seeing the young man about two years older than me. Him and I clicked immediately. We saw each other every day and we would eat lunch everyday together. After about a few weeks, in November, him and I made it official, but kept the relationship on the down low. He wasn’t ready to tell his family and I wasn’t ready to tell mine yet either. Well, several hours ago, I learned he wasn’t being completely honest with me about his past relationships. He told me it had been about a year since he had dated anyone, and that the girl he was dating dumped him. I found out that he has actually dated three or four girls in the past year and had sex with one and then dumped her a week later. I don’t know what to do? I know the smart thing to do would to confront him about it and ask why he hasn’t been honest with me, but that would be admitting I wasn’t completely private about the relationship. Can someone help me please?