The boy knew that his girlfriend was cheating on him. He did not expect her to do that to him because he had given her everything. He was loyal. In this age, there are people who thought that cheating is a normal thing, but his first girlfriend was the one who stole valuables from his savings and took everything from him. He thought that the one who cheated on her was a second-verse relationship. But in fact, everyone thought that it was actually the worst relationship because cheating cannot be justified ever.
Picture is from the prompt