English: The reason he said “between me and you” is to inform him that the strife would eventually reach the two of them as well. Even if Lot would say that Heaven forbid he would not quarrel with his master… nevertheless he would admit the matter.
Context: Avraham anticipates that a dispute among the herdsmen will not stay contained; he names the personal level of conflict before it appears.
What Is Learned
Strife among dependents is treated as already latent strife between the principals.