My boyfriend has love letters from his ex in his wallet. Should I care?

We have been dating 9months now. Things seemed to be going great then he left his wallet at my house. He has never let me look through it so I have aways been suspicious of his wallets contents. My yorkie found this wallet and took it too my sister. My sister then went through it and came to me showing me: LOVE LETTERS TO AND FROM HIS EX ..

Idk what to do. Help?
My boyfriend has love letters from his ex in his wallet. Should I care?
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