Love thy neighbor is likely in the Bible alongside love thy enemies because they are generally the same people.
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Love thy neighbor is a phrase uttered by one who did not know his neighbor very well or didn't love himself enough.
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Love thy neighbor is an attempt to defend against human instinctual aggressiveness which is impossible to fulfill since anyone who follows such a precept in present-day civilization only puts himself at a disadvantage vis-a-vis the person who disregards it.
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Love thy neighbor 1s 2rue meaning is not that it is a command from God which we are to fulfill, but that through it and in it we meet God.