Confessing to my mom

Help me, I am 16 and I felt itch and discomfort in my lower body parts and I looked and something not right and I flipped out. I was super scared and ran to my mom. I have had protected sex with my boyfriend for months (my mom didn't even know) and but I haven't had it in 4 weeks. When I described what I felt to my mom and she was calmly questioning me about it and assumed that I have a yeast infection and then I confessed that I am not a virgin and I'm scared about my vagina. She went into shock but is being understanding and said she once was a teen too. However, I have no idea how to tell my boyfriend that my mom now knows. I don't want to make him upset about this. Help me please 😭😭😭😭 My mom is telling me to tell him and I don't want to hold this from him.