Inside Teddi's Affair with Her Horse Trainer

It seems we finally have answers as to what may have led to the sudden split of Teddi Mellencamp and Edwin Arroyave: The RHOBH alum had an affair with her married horse trainer, Simon Schroeder (inset).

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"Simon and Teddi had a thing several months ago, but it's not still happening," a source exclusively tells Us, while a second source notes that Arroyave spoke with