Sqaures between Cancer and Libra

Planets in Cancer give some idea of the approach to domestic life and the native's ability to settle down to establishing a home and family. When there are squares between planets in Cancer and Libra, the chances of building a really firm foundation for marriage are to some extent diminished. - Ronald Davison, Synastry

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Ouuuch! I've always wondered about this cruel contradiction. He doesn't really explain and I've never really thought about it.

Cancer desires to give and receive care. A connection to libra might create the expectation your partner should return an equal amount of affection. If they don't, then resentment builds?

I'm not sure I understand all of issues here.