When you unadd or remove someone on Snapchat, it does not automatically delete the messages you have sent or received from that person. Unadding someone simply removes them from your list of friends on the platform, but it does not affect the content of your conversations.
Does Unadding Someone On Snapchat Delete Messages?
Here's what happens when you unadd someone on Snapchat:

Friend Removal: When you unadd someone on Snapchat, they will no longer appear on your Friends list, and you will be removed from their Friends list as well. This means you will no longer be able to see their Story updates, and they won't be able to see yours unless you have chosen to make your Stories public.

Existing Conversations: Any existing conversations or messages you have exchanged with that person will still be visible in your chat history. The messages will remain intact, including text messages, photos, videos, and any other content that was shared. However, it's important to note that if the other person has saved any messages or content from the conversation, they will still have access to it even if you unadd them.

Message Retention: Snapchat retains messages in the chat history until both parties have viewed them or until they have expired. By default, unopened messages are deleted after 30 days, while messages that have been viewed are deleted after 24 hours. However, users have the option to save specific messages or media in the chat by pressing and holding on them.

Privacy and Visibility: Although unadding someone removes them from your Friends list, it's important to remember that Snapchat is a public platform, and unless you have adjusted your privacy settings, your content may still be visible to a wider audience. Always review your privacy settings and ensure you have set them according to your preferences.

It's worth noting that Snapchat's features and functionalities may change over time. To get the most up-to-date information and guidance on how Snapchat handles message retention and unadding users, I recommend referring to Snapchat's official support or documentation.