The BOM Ambassadors say

This is a tough situation but, you need to take responsibility and tell the truth. If you want to continue to have any kind of relationship with your boyfriend, you will need to be honest with him. In addition, you want to set a good example for your child about how to act in relationships. Being dishonest with your boyfriend about fathering a baby that’s not his will certainly affect the relationship between your boyfriend and your baby, because in the end the truth always comes out. If you have any fear of physical danger by telling your boyfriend the truth, make sure you talk about it in a public place or with someone else there. Your safety and the safety of your unborn child are very important.