We won't ever know. I don't see Boromir as being all that 'nice' - certainly the movie rewrote him as a flawed hero, as opposed to the proud, but often thuggish, warrior of the book. Which is not to say he didn't have some good in him. His final act was selfless & worthy of the respect Aragorn & the others show him (respect for his prowess in battle, not for his social skills or pleasant company btw). But this is one moment. He died heroically, but his concern all along was with Gondor. His repentance came with the realisation that he was dying. If he had succeeded in avoiding death I don't see any reason that he would have changed essentially. He wouldn't have turned into a Faramir.
The idea that he would have 'betrayed' his city, his people & most importantly his father by going off on a wild goose chase after a couple of Hobbits is something that is not in character for him - much though we all might like the 'Happily ever after-ness' of it. Boromir was 'lucky' - he achieved a heroic death & had time to 'confess his sins'. As B88 has so cogently argued, though, things had not come to the 'pinch'. Boromir, I think, would have sided with his father. Denethor would have determined whether Boromir accepted or rejected Aragorn. He wouldn't have chosen Aragorn over his father, if push came to shove.
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