He was not the one lying Sven was. Whichever one you help can be follower.
Might depend on whom you encounter first. Faendal asked me to deliver a letter to her. I cannot remember what the content was about, but the fact alone that he could not do it himself upset me. I think he tried to frame the other guy or make him look bad. Whatever, he is shifty one, two-faced and lacks a spine. I passed the letter on, but told the girl about it. Afterall, Faendal never said not to tell her the truth... Shall she judge his behaviour, and that she did. I think I never came across the other guy and only met him randomly much later in the game.