How did mutual affection turn into unrequited love?

好好的爱情怎么就变成自作多情了？

youdao

Any other circumstances causing alienation of mutual affection.

其他导致夫妻感情破裂的情形。

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Divorce shall be granted if mediation fails because mutual affection no long exists.

如感情确已破裂，调解无效，应准予离婚。

youdao

The criteria for compatibility had little to do with mutual affection or a shared enthusiasm for spicy food and Fleetwood Mac.

NEWYORKER: Looking for Someone

When she did, West told TIME, she was left with the impression that there was nothing more than "mutual affection" between Willey and Clinton, not a sexual encounter and nothing in any way upsetting.

CNN: Could Clinton Still Settle With Jones?

They had a loving relationship based on mutual respect and deep affection.

FORBES: Niall Ferguson, Keynes and the Long Run