“Nevertheless, not being warm enough or feeling “unloved” is not a halachicly actionable reason for either party in the absence of more substantiative reasons.”
Actually, does the Torah not state that if the husband finds something unseemly in his wife he should give her a GET? And if she remarries, and her second husband hates her and divorces her, she cannot be re-married to the first husband. Check out Devarim Perek 24, Pesukim Aleph and Gimmel. I would find it rather hateful to be married to someone who made me feel unloved. But the Torah clearly uses finding fault and hate as criteria for divorce. Why should two people who make each other miserable stay in a loveless marriage?