I've finished reading demons yesterday but i cannot understand

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I've finished reading demons yesterday but i cannot understand Stavrogin. at first I've thought that he's a "pure" nihilist, without being spooked like kirillov or pyotr, that he was doing everything ranging from self degradation to commiting heinous deeds just to push his limits and to stop the boredom, and at the end of the novel killing himself because of the emptiness and meaninglessness in his life.
But after reading "At Tikhon's" he seems to feel guilt after driving the little girl to suicide, a need to repent and to find forgiveness, yet he still acts like a cunt, screwing lisa, ignoring the obvious threats to his wife or shatov and so on. can someone help me understand this man? Is he a mix of raskolnikov and Svidrigailov?
also
>jesus will forgive you the rape of an innocent child if you forgive yourself, heh, fuck me, he'll forgive you even if you don't
what did Tikhon mean by this?