That wasn’t the only reason Himmler didn’t trust Heydrich. In the multi-layered Nazi apparatus of terror Heydrich was head of the “Sicherhienstdienst’’(SD) or “SS Central Security Office. He kept the goods on EVERYBODY, even Hitler. Everybody in the Nazi hierarchy was nervous around him . It was felt he knew too much about Nazi bigwigs, things that might compromise them and they knew Heydrich was not above using blackmail to eliminate rivals. He ran a brothel called “Salon Kitty’’ and had it rigged for sound, lest some tidbit be given away by some Party member in a moment of passion. The were many who believed Himmler might have even set him up to be killed. Heydrich was a ruthless SS bastard.
The “SS Central Security Office” didn’t exist. what i think you’re referring to is the Reichs Main Security Office [Reichssicherheithauptamt], or RSHA, which didn’t come into existence until 1939, and was composed of the Sicherpolizei [Gestapo and Criminal Police], and the SD [SS Security Service]. Heydrich founded the SD shortly after he joined the SS in 1931. He was also in charge of the RSHA, and when he died, he was the Reichs Protector of Bohemia-Moravia [Czechoslavakia].