advice

my boyfriends mom found out he and i had sex (both for the first time and we’re both 17) and got very upset with him for breaking her trust and going behind her back. she told him she wants to sit down and have a conversation with both of us. her and i have a really good relationship but i’m so scared that it’s ruined. he said she’s not angry with me and expected that we would have sex at some point but i still feel like i betrayed her and she’s going to hate me. i don’t know what to do