to be unfaithful to your partner
パートナーに不誠実である (pa-tona- ni fuseijitsu de aru)
"She found out that her boyfriend had cheated on her."
"彼女は彼氏が彼女を裏切ったことを知った。" (kanojo wa kareshi ga kanojo o uragitta koto o shitta.)
to increase by a certain amount or percentage
to put in great effort to achieve objectives
to cause people to notice or understand something
to establish a high standard or level of achievement
to manage or resolve disagreements or disputes
to gradually start doing something new or difficult
