mistakes.
He had cheated. He had broke (his/her) heart. He had messed everything up. He was ashamed. He regretted. He scolded himself. He was mad at himself. He was disappointed in himself. He didn't want to loose (him/her). He didn't want to say goodbye.
(He/She) caught him. (He/She) broke. (He/She) was done. (He/She) was mad. (He/She) was upset. (He/She) broke up with him. (He/She) said goodbye first.