I think you should let him get rid of them when he is ready to. Somethings need to be on his time line. You may mention seeing them and asking if he didn't mind putting them away. It would be like him asking you to toss every photo of you and past boyfriends or friends he didn't like. The past in this sense has nothing to do with him or you.

I also would quit looking for things like when he called her. Ali, it is over. Quit dredging it up. I adore you and hate the idea of you hurting yourself like this. I am sure it doesn't help BF either. He is with you now. He didn't cheat, he dated someone whilst you weren't together, period. Let it go.

hugs, kat

Me-53(and learning!)
S24, S21, D18, D17
Just keep swimming, Just keep swimming. Dory