Not enough detail is given in the manga to be sure, but I thought it was heavily implied, with the cogwheel motif that showed up those times—those cogwheels which first show up in a narrative monologue about them all being cogs in a story—that there's a sort of natural history-correction force that tries to draw history (or alternatively the game "plot") back on-course to the pre-plotted routes (ultimately unsuccessfully, power of love and all that, no doubt). I didn't think Lilia was casting magic as such.
Which doesn't fully answer the question, but assuming it's correct, does give us some boundaries:
1. I think first, it's quite likely Cedric is definitely his natural unperturbed self, as much as is possible, at the beginning of the story, when nobody's had time to act on their past-life memories (which Aileen recalls right at that moment). Which is to say, he's definitely a two-timer, a jerk, and possessed of extremely poor judgement, without help. XD
2. While I hadn't considered it, it is quite plausible to thing that he might be a bit under the influence of mind-warping forces near the end, which brings into question whether he's actually a criminal psychopath, or not.