? My friend was kind of mad because she was there

I went out with my boyfriend and I let him go through my phone, I have nothing to hide but I took it away because he saw a picture of me and it was with my acne which I’m very cautious about. I always took pictures of my acne journey which I never show anyone. However, when I said can I see your phone he said no and I’m like oh why? And he’s like why would you want it and I’m like why I can’t and he said I have pictures of my friends on there like FaceTime and his friends looked at him they both did, (his friends were also there) is he hiding something should I be concerned?