Starred Users

Starred users would be extremely useful. You could star someone regardless if they friend you, block you or mute you. This starred person would not know you did and you can open a "starred menu" to see all of your starred users. Starred accounts can be unstarred easily. In my pathetic example I want to keep my ex-girlfriend's old account's dms as there are like 60 thousand of them. She blocked me knowing this and I have lost the account off my dms list, search list, etc.