苦笑着说不分手
[kŭ xiào zhe shuō bù fēn shŏu]
It's a rather sad and self-deprecating expression reflecting pain, perhaps stemming from a breakup where the speaker, despite being in a painful state, is trying to be understanding and generous towards their former love interest, indicating reluctance yet helplessness at not wanting the other party to feel guilty over their break up decision.