Buyers purchased a house with another agent behind my back

[John Apple]

I have buyers who I spent the last 3 months driving all over the county showing properties to. We recently took a ‘pause’ as they paid off debt to get a higher preaproval. Then, yesterday I came across a Facebook photo of them with another agent and a ‘sold’ sign. Is there anything I can do? We signed a buyer agency agreement but my broker told me those are barely enforceable and not worth the time to pursue legal action.