to cheat on
to have a secret romantic or sexual relationship with someone other than one's own partner

浮気する, 裏切る

[動詞]
to lead on
to intentionally deceive someone by making them believe something that is not true

誤解させる, 欺く

[動詞]

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to have a secret romantic or sexual relationship with someone other than one's own partner
浮気する, 裏切る
to intentionally deceive someone by making them believe something that is not true
誤解させる, 欺く