If someone doesn’t tell you the truth is it because he isn’t serious about you?

Asked by Dannyfanpooch (70) December 3rd, 2018 from iPhone

the guy I’m dating is a great father but through my guessing because this child looks absolutely nothing like him in the pics he shows me, and then doing some snooping on his ex’s social media I found out the child he calls his daughter isn’t biologically his, he met her when she was 3 and basically raised her. He and the ex are no longer together but he still takes the girl, who is now 11 on the weekends, I asked a question the other night “so how old were you when you found out you were going to be a dad?” but he lied and said the age he would of been if the child was his. I’m also curious because I told him I liked him a month ago and he said he didn’t want to rush into anything because there’s still a lot we don’t know about eachother and it seems he doesn’t want me to know either, Should I just assume he doesn’t see me as anything potentially serious?