Why would your boyfriend be really mad at you for taking pics of him on his phone?

I didn't have my phone on me so I wanted to take some pics of the sunset. I was just joking around and said that my boyfriend might be in some of the pics. He got really mad at me and was raising his voice, telling me to delete them or not to be taking pics of him on his phone. He said he doesn't wanna go in the gallery to delete pics of him so don't take pics of him. But... What's so bad about that? Why wouldn't a guy want pics of himself on his phone? Would there be a reason? It wasn't intentional on taking pics of him. He just so happened to be in the view, too...

Why would your boyfriend be really mad at you for taking pics of him on his phone?
Post Opinion