Matt went to the student health center and sought the support of Ella, a student who is specially trained in maintaining confidentiality, who was able to offer Matt advice and a sympathetic ear. This is best described as:

Psychotherapy

Explanation:

Confidentiality refers to an act of maintaining the integrity of information given or offered to an individual such that the hearer does not disclose such information to other channels and details of the information stays between the therapist and the patient. In psychotherapy, salient information will be needed from the client in other to aid the therapeutic process, hence, it may involve the disclosure of certain personal details which its disclosure by the client was only made due to it's importance to the healing and recovery process. Hence, keeping this information and maintaining its integrity is a professional practice expected of the therapist.