Just found out I am having a baby and it's kinda bitter sweet because I had an affair so the baby is…

Just found out I am having a baby and it's kinda bitter sweet because I had an affair so the baby is not my husbands baby. I feel really bad but I don't believe in abortions AT ALL! My husband and I have been having issues for a long time now but he doesn't wanna let me go. I don't know how to tell him because I know it will crush him.