Answer first
Compare the current following list against the current followers list.
The result includes people who may never have followed you, not only people who unfollowed.
Worked check
GroupSet ruleExample
MutualFollowers ∩ Following363
Not following backFollowing − Followers184
You do not follow backFollowers − Following341
Read the relationship state correctly
The check compares two present-tense sets. “Outgoing only” says where the username appears now; it says nothing by itself about intent or history.
Search, review context, and verify high-value relationships individually.
Context before action
Mass-unfollowing from a generated list can cause mistakes and may trigger platform limits.
Mutual status can change after the export, so verify accounts that matter.
Choose the next step
Review the relevant group and leave intentional one-way relationships alone.