diff --git a/app/models/relationship.rb b/app/models/relationship.rb
index ed90205ff..7002ebcf3 100644
--- a/app/models/relationship.rb
+++ b/app/models/relationship.rb
@@ -161,6 +161,21 @@ def self.create_unless_exists(source_id, target_id, relationship_type, options =
     exception_message = nil
     exception_class = nil
     if r.nil?
+      # Add to existing media cluster if source is already a target:
+      # If we're trying to create a relationship between C (target_id) and B (source_id), but there is already a relationship between A (source_id) and B (target_id),
+      # then, instead, create the relationship between A (source_id) and C (target_id) (so, if A's cluster contains B, then C comes in and our algorithm says C is similar
+      # to B, it is added to A's cluster). Exception: If the relationship between A (source_id) and B (target_id) is a suggestion, we should not create any relationship
+      # at all when trying to create a relationship between C (target_id) and B (source_id) (regardless if it’s a suggestion or a confirmed match) - but we should log that case.
+      existing = Relationship.where(target_id: source_id).first
+      unless existing.nil?
+        if existing.relationship_type == Relationship.suggested_type
+          error_msg = StandardError.new('Not creating relationship because requested source_id is already suggested to another item.')
+          CheckSentry.notify(error_msg, source_id: source_id, target_id: target_id, relationship_type: relationship_type, options: options)
+          return nil
+        end
+        source_id = existing.source_id
+      end
+
       begin
         r = Relationship.new
         r.skip_check_ability = true
diff --git a/test/models/relationship_2_test.rb b/test/models/relationship_2_test.rb
index a95fc134f..4e8d976f7 100644
--- a/test/models/relationship_2_test.rb
+++ b/test/models/relationship_2_test.rb
@@ -463,4 +463,29 @@ def teardown
       end
     end
   end
+
+  # If we're trying to create a relationship between C (target_id) and B (source_id), but there is already a relationship between A (source_id) and B (target_id),
+  # then, instead, create the relationship between A (source_id) and C (target_id) (so, if A's cluster contains B, then C comes in and our algorithm says C is similar
+  # to B, it is added to A's cluster). Exception: If the relationship between A (source_id) and B (target_id) is a suggestion, we should not create any relationship
+  # at all when trying to create a relationship between C (target_id) and B (source_id) (regardless if it’s a suggestion or a confirmed match) - but we should log that case.
+  test "should add to existing media cluster" do
+    t = create_team
+    a = create_project_media team: t
+    b = create_project_media team: t
+    c = create_project_media team: t
+    Relationship.create_unless_exists(a.id, b.id, Relationship.confirmed_type)
+    Relationship.create_unless_exists(b.id, c.id, Relationship.confirmed_type)
+    assert !Relationship.where(source: b, target: c).exists?
+    assert Relationship.where(source: a, target: b).exists?
+    assert Relationship.where(source: a, target: c).exists?
+
+    a = create_project_media team: t
+    b = create_project_media team: t
+    c = create_project_media team: t
+    Relationship.create_unless_exists(a.id, b.id, Relationship.suggested_type)
+    Relationship.create_unless_exists(b.id, c.id, Relationship.confirmed_type)
+    assert !Relationship.where(source: b, target: c).exists?
+    assert Relationship.where(source: a, target: b).exists?
+    assert !Relationship.where(source: a, target: c).exists?
+  end
 end