After the assassination attempt on Hitler, Hilter had all involved killed which included Rommel. Rommel knew of the assassination attempt but didn’t warn Hitler and was forced to drink poison.
Rommel committed suicide in October 44, two months before the Bulge. He had been seriously wounded in July 44 and was essentially not in active command after that. Rommel was given a cyanide capsule as an alternative to a kanagroo court trial in front of a People’s Court.