From whom did Bheem married???

At the time Bhima kills the demon Hidimba who was king of demons of forest Kamyaka, he meets his sister Hidimbi; they eventually get married and have a son, Ghatotkacha. Hidimbi promises Kunti that she and Ghatotkacha will stay out of the Pandavas' lives and away from the luxuries of court. When Bhima killed the demon Hidimba, he became the King of Kamyaka for 5 years. In Mahabharata, the demon army from Kamyaka fought the war alongside Pandavas.

Then the Pandavas attended the Swayamvara of Drupada princess, Draupadi. The Pandavas, led by Arjuna, were successful at the Swayamvara. With his brothers, he was married to Draupadi, who gave birth to a son, Sutasoma. At a later stage, Bhima also married Valandhara, the daughter of the king of Kasi, and had a son named Savarga. Among Bhima's three sons, Sarvaga did not participate in the Kurukshetra war, Sutasoma was killed by Ashwatthama and Ghatotkacha was killed by Karna. In the Hindu epic Mahabharata, Sarvaga was the son of Bhima and his wife Valandhara. He ascended to the throne of Kashi. In the Hindu epic Mahabharata, Valandhara was the princess of Kashi and the wife of Bhima. They had a son Sarvaga.