While Anakin secretly called Padmé, Rex guarded the barracks and even covered for him when Obi-Wan Kenobi arrived. This shows that Rex not only knew about Anakin and Padmé's relationship, but they trusted him to keep their secret.
Rex Might Have Helped Padme in Attack of the Clones
They told their pilot to follow Dooku's speeder, but Dooku's escort ships fell back and started firing at them. One of those shots sent Padme and a Clone Trooper careening from the ship. That's the Clone that some fans believe was Captain Rex.
Rex was 100 percent loyal to Anakin and was his truest friend out in the field. Anakin had to hide so much of himself from other Jedi, but he could be completely open with Rex, and he knew that Rex would never betray him.
Rex and Ahsoka are very close friends, having met each other at the battle of Christophsis after she was assigned as Anakin's apprentice. He took an immediate liking towards her and later congratulated her when she helped Anakin destroy the Separatists' shield generator.
As night fell, Rex met with Skywalker, Windu, and Boll at Urus's palace to discuss the problem of the uncontrollable Zillo Beast with Palpatine. While the Dugs wanted to kill off the Zillo Beast, the Jedi wanted to preserve the creature, as it was one of the last of its near-extinct species.
The last time Rex and Anakin saw each other was Anakin promoting Rex to commander so he could lead the 332nd Company to lay a siege on Mandalore before the latter rushed to go rescue Chancellor Palpatine from Count Dooku and General Grievous.
After she learned of her husband's transformation into a Sith, she confronted him on Mustafar in the hopes that he had not truly changed, but he instead attempted to kill her. She ultimately died of a broken heart after giving birth to the twins Luke Skywalker and Leia Amidala Skywalker.
Clones like Rex, Kix, Gregor, and ARC Troopers removed inhibitor chips and preserved their free will post-Order 66. The Bad Batch, Alpha-Class ARCs, and Cut Lawquane defied Order 66 due to immunity, free-thinking, or lack of contact.
Darth Vader's true identity as Anakin Skywalker was a highly guarded secret, known only to a select few individuals including Palpatine, Obi-Wan Kenobi, Luke, Han, Leia, R2-D2, C-3PO, Master Yoda, Bail Organa, Ahsoka Tano, Darth Maul, Grand Moff Tarkin, Grand Admiral Thrawn, Jocasta Nu, Ferren Barr, Verla, Reva, ...
However, Ventress underestimated Rex's mental strength—Rex contacted Skywalker, but addressed him as his first name, "Anakin," instead of his usual "General Skywalker", which warned the Jedi of something amiss. Ventress left to confront the Jedi herself, while the battle droids held the six surviving clones captive.
Yoda's Conversation With Anakin Hints He Knows About Padmé
Right before Anakin is due to leave for Scipio, he discusses the matter with Yoda and Mace Windu. During this scene, it is heavily implied that Yoda – and thus, Windu – are both aware of Anakin's deeper feelings for Padmé.
This means that although Anakin and Padmé tried to hide their love throughout Star Wars, several of their closest friends, including Ahsoka, Rex, and Obi-Wan, knew about their relationship but preserved their secret.
Did Padme ever sleep with anyone before Anakin? It is theoretically possible, but highly unlikely. She did have feelings for Clovis, but that relationship didn't really go anywhere and there really aren't other romantic prospects we know about.
At some point after his transformation into the armored Darth Vader, Amidala's husband, the fallen Jedi Knight Anakin Skywalker came to visit the mausoleum, stricken by grief and remorse for his part in her death.
Anakin Hated Obi-Wan Because of an Imagined Relationship With Padme. Although Padme and Obi-Wan's affair couldn't have been further from the truth, Anakin apparently built up a scenario in his mind, which was only heightened by the Jedi Council's obfuscation in other areas.
Honestly, I just couldn't figure out who she was or why she was even in the funeral procession. This also means that for the longest time I forgot I could just look up the credits of the film. Long story short, she is Padmé's niece, Pooja Naberrie, and was portrayed by Hayley Mooy.
Later, Rex was reunited with his old friend Ahsoka Tano when she returned with news of Maul's location on Mandalore. In an emotional reunion, Rex and his men painted their helmets orange in an homage to their former commander and agreed to follow Ahsoka into battle once more.
Summary. George Lucas changed Anakin's Force Ghost from Sebastian Shaw to Hayden Christensen in Return of the Jedi. Lucas attributed Christensen's young Force Ghost to Anakin having metaphorically died as Darth Vader. Obi-Wan Kenobi used James Earl Jones' voice with Christensen's acting to portray young Vader.
Originally Answered: Why was Captain Rex saying "Find him. Find him." in season 7, episode 11 of The Clone Wars? He was telling Ahsoka to find his report on CT-5555 “Fives”, because it explained his suspicions that the inhibitor chips had a more nefarious purpose than just keeping the clones obedient.
This indicates that Rex hasn't interacted with Obi-Wan since the Clone Wars, making an appearance by Rex in Obi-Wan Kenobi impossible without contradicting Rebels.
Anyway, in answer to your second question, Rex is not a Mandalorian. His armor bears a resemblance to Mandalorian armor, however, because the clone template Jango Fett wore Mandalorian armor, and the armor of clone troopers was based upon Fett's.
