Once the client can feel a new emotion fully, future pace the 3 events that the client had shared where they will interact with this person in the future.
Ask the client to test the events that have been future-paced by closing their eyes and imagining themselves in different situations with the same person in the future and to let you know how are they feeling in their imagination.
Ask them to observe the changes they notice in their life in the coming days and then report to you in the next session, what changes they have noticed.