即時通英文失戀可以用以下的句子來表達：
* I lost my love on the instant messenger.
* My relationship on the instant messenger ended with a breakup.
* My heart broke on the instant messenger when I lost my lover.
* I had a breakup on the instant messaging app.
以上句子僅供參考，如需更多表達，請閱讀英文原文或諮詢專業人士。