I'm not sure there can be loving without commitment, although commitment takes all kinds of forms, and there can be commitment for the moment as well as commitment for all time. The kind that is essential for loving marriages - and love affairs, as well - is a commitment to preserving the essential quality of your partner's soul, adding to them as a person rather than taking away.
Some Men Are More Perfect Than Others (ed. 1973) - ISBN: 9780553134285