Seeing his wife; ex-wife, Wendy, driven away by a man he knew was a police officer had first enraged him. Then, it was a comfort.
Oliver was certain that man had gotten to Wendy while he was in prison. Probably helped her trick her way into Law school, gotten her to sell the house, and probably was taking some of the money!
Clearly Wendy would never be able to make plans on her own, would have never sold the house behind his back… in fact, it was probable that Police officer who got her to go to Court and give evidence against him!
Oliver felt strong assuming it wasn’t his wife who plotted against him, it was the man who ‘controlled’ her.