Sue

NN,

“Let us put it another way “eros” describes the type of love which exists between a husband and wife which should not properly exist between other people (surely we can agree that there is such a love and that it should exist only between a husband and wife).”

That is what 1 Cor. 7 is about – the relationship between husband and wife, and it is symmetric. I am unaware that Paul thought that ‘eros’ should exist in marriage.

“On agapeo & phileo – they are not completely synonyms in the ancient text though certainly their scopes of meaning overlap (not really relevant to the current topic but worth the two line response)”

I think you will find that scholars regard them as synonyms as they are used throughout scripture. BDAG writes,

“Phileo is usual word in earlier Greek but gradually loses ground to agapao esp. in the Koine.”

Scholarship does not support your definitions of the word.