I wouldn’t mention your single-mom-with-daughter-in-university thing, but say: “Look, it wasn’t personal and please don’t take it that way...”
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It WAS personal. You chose a "single-mom-with-daughter-in-university" for absolutely personal reasons. You did not choose a R/E agent for professional reasons. You could also have spread out your largess by using different friend-agents for the buy and sell ends, if you also purchased a new-to-you home.