BF/BD is my Cousin 😭

Please don’t judge me because we just found out today. We use to talk and chill back in high school over 10 years ago but it never went any further than that like we never went together. He started talking to someone else and they got married he went into the army and has been home now for the past 6 months he is no longer with his wife. He reached out to me two months ago we been rekindling things and actually decided to give us a shot being in a relationship. When we started talking about our grandparents he mentioned his great grandma and my granddad has the same last name so I called my granddaddy and he said yeah but he also said my bf granddad is his cousin as well so now I’m just confused and now things are complicated because we’re expecting as well. Idk what to do?