My husband is against my open adoption, what do I do?

The daughter I gave away 1990 was by another man. 2012 my husband found out by me I found her on facebook. He threatened to divorce me but quickly got over it. Now i can’t say her name or see her. I’m afraid that I’ll loose her. I also haven’t been truthful to my daughter. WHY DOES MY HUSBAND NOT KNOW THAT i WANT TO SEE HER and why does he not care?