I am disappointed in my boyfriend!

To cut all matter short, we been dating for three months. He told me he had a kid, I was cool with it until out of nowhere someone told me he has three kids! I didn't believe it until I asked him, and he said yes it's true, he said he couldn't tell me about those kids because he wasn't sure of them. I really have feelings this guy! Am lost at this moment I don't know which decision to take. On the other hand am little too young to be a step mom of three kids. Any advice please, thanks in advance.