I believe you are referring to snap chat. In which case you just can't access the photos again although they are stored on your phone and the servers for a period of time if they are ever deleted.
An I actually just went though a similar experience with a breakup recently. But I'm of the if its there leave it and learn from it mindset, so I'm not entirely worried in that case.
Yeah, probably snap chat. I don't use that one either.
I commend you on the ability to let it go and leave it stored. I think that's an uncommon trait, but a good one to have.
Even bad memories are still memories.