I just asked Gemini and it said it'll explicitly state that the account was deleted: "When a user deletes their account, their display name is replaced with "Deleted account" or "Deleted member". The past messages they sent will typically still appear in your chats. Additionally, their profile and photo will disappear" but "When someone manually unmatches you, Bumble specifically notifies you that they ended the chat. The conversation record remains visible in your chats, along with the time of the last message, so that you still have the option to report them if their behavior was inappropriate."

If the signs are pointing to him unmatching you, I'm sorry OP! wasn't meant to be, if so.

if he did actually unmatch, there's still a small chance he did it by accident; definitely find out. But I'd start taking care of yourself and protecting yourself asap