Yes, the social media site Instagram. I don't have any real experience on Instagram, so I can't reliably say that my information is 100% accurate; however, from what I had heard, there is a time limit on it. If I'm incorrect, I apologize for the misinformation to any who read these comments.
You are correct about non-cloud deleting; however, most people don't think that far ahead. eg. "Ooooh, I'm in love and this is forever! I want to write this down and store this loving picture forever!" then they break up a month later... this would be the scenario I see happening most (for my devil's advocate info).
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.