Should I delete the messages from my ex?

It's been almost a year now, he's got a new fiancee, I moved on but still single. Then I realized I never deleted his Whatsapp messages.
I'm really scared to open it again, as it was saying "Can I see you now? " and we met and broke it off.
So I really feel it's bringing me down everytime I remember it still exists, but I'm not sure if I'll ever need it again?
PS: We ended up on bad terms, I even blocked him on social media.
Should I delete the messages from my ex?
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