Boromir was the only member of the Fellowship who tried to take the ring. He was vain and entitled, believing that he alone, of the Fellowship, was worthy of the ring. He was a thief and a traitor.
Boromir was a Lord of Gondor, and he wanted everyone to know it. “His garments were rich, his cloak was lined with fur, and he had a collar of silver in which a single white stone was set.”
Boromir did not redeem himself. He failed to protect Merry and Pippin from the orcs, who wouldn’t have found the hobbits wandering alone if it weren’t for Boromir’s actions in the first place.
Boromir would not have felt remorse or apologised if he had succeeded in taking the ring; he only did because he was caught. His image was so important to him that his “heroic” death was staged to create sympathy and goodwill so that he would not be remembered through the ages as a thief and a traitor.
Boromir got what he deserved.
Boromir resisted multiple times. His temptation was kicked into overdrive when he picked the ring up by Frodo’s necklace after Frodo dropped it. Boromir’s corruption is not a fault in him, it is an example of the ring’s power. Even Gandalf was sent into an hours long muttering disconnected mental state just from touching the ring for half a second. Faramir never saw the ring. He never held the ring. He just knew it was there, and still almost failed.