My boyfriend has naked pictures of his ex?

JoleneRays
I started seeing this guy about 6 months ago and in May I discovered he was having inappropriate text conversations AND face-timing his ex. I confronted him and he told me he would stop and has tried to show me how much he cares about me and make it up. He sent her a text telling her they should end all communications because he didn't want anymore interference with our relationship (this all didn't happen until this month, July). A few days ago I found a "photo vault" and in the vault were naked pictures and a video of him screwing his ex. I haven't said anything because I don't know how old they are or when the last time he even looked at the vault... they dated a year ago and she lives in Atlanta (we're in columbus oh) so they probably face-timed a lot while dating which I why I'm not sure if they have been there for awhile and he's forgotten or something else. I feel like I'm being a blind idiot I don't know what to do. I am a beautiful and successful girl but he makes me feel so insecure about myself because of all this. I don't know if I should just leave or ask him about it.
Updates
+1 y
To respond to a lot of your questions I have asked him if he still wants to be with her and even told him to please go back to her if that's what he wants because in her texts to him she is telling him she still wants him.
Updates
+1 y
He swears to me that he only wants me and she doesn't compare to me in any way. He has told me he is trying to regain my trust and cares about me. I'm unsure why he would lie to me about wanting to be with her when I gave him the opportunity leave
My boyfriend has naked pictures of his ex?
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