KILLIAN | BAE
If I'd come from the same time as you I wouldn't believe a lick of it, either. As for how much he's changed... I can't claim to know everything, but he did die to save us. To save you. That much I saw with my own eyes and it was no trick.
If I'm being honest, I'd rather for Belle's sake she were with someone else, but I mean it when I say she's smart enough to know what's good for her. If she can find it in her heart to forgive him I do believe there's something worth forgiving, however small a seed it might be.