My man still has his ex’ms nudes on his phone

Please help me, l don’t know if l am overreacting. I have been seeing this guy for 6 months. Everything is good but l was recently on his phone and wanted to send pictures we took to my phone (with permission). Whilst l was doing this l decided to go through his pictures ( l don’t know why) and l saw that he still has his sex tape and nudes from his past relationship. He said they broke up a year ago. What’s bothering me is why he still has them on his phone? I confronted him about it and he said it was my fault to go through them and l shouldn’t overreact because he once told me that him and his ex used to have sex all the time (like four times a day).

Please help me