I have a test where I am given the following article, what is an answer for the question: Who has Mazzoli's friend been unfaithful to? ?

Lawrence Hammer and Dean Mazzoli are two Naval Officers undergoing the rigorous and demanding Navy BUD/s training program. Both men quest to become Navy SEALs. During the training Hammer is shown as cocky and not a true team player. Mazzoli is a natural leader who is respected by the other trainees. The two men clash over time due to Hammer's attitude making a bad name for everyone. The two men's feud eventually is seen by the training instructs and after being punished in a "military manner" the two become friends. On liberty Mazzoli takes an interest in Barbara, a known love interest and friend of Hammer's. Barbara and Mazzoli share a romantic moment under a capsized canoe but Mazzoli breaks away before anything further happens knowing that his friend Hammer has been "with" her for a while. Later that night Hammer and Barbara elope and Mazzoli is shocked but accepts the marriage.
The two finish their BUD/s training and Mazzoli informs Hammer that he is completing his SDV training on the East Coast, not the West Coast as Hammer will be doing. A brief confrontation between the two occurs on the beach and subsides when Mazzoli says it is because of Barbara. Soon Iraq invades Kuwait and Hammer is seen on a reconnaissance mission with Bosco, who was Mazzoli's and Hammer's former lead training instructor. After coming under enemy fire Bosco is taken prisoner. Hammer and Mazzoli reunite when Mazzoli comes to aid in the rescue mission of Bosco. While preparing for the mission the two catch up, with Hammer talking about how Barbara and her son Josh both miss seeing him. He further goes on and tells of his infidelities and about Barbara knowing about his unfaithfulness. Hammer and Mazzoli successfully rescue Bosco but Hammer is severely injured during the mission.

Barbara