LW, Jenny clearly doesn't think you're the best man for her, because she divorced you. And if everything you say is true, why the heck would you want Jenny back if she's decided she prefers a "manipulator and liar" over you? Why wouldn't you rather move on and find a new best friend who really has your interests at heart and a new romantic partner who thinks you're great?

(I have the sneaking suspicion that "manipulator and liar" translates as "he's dating my ex instead of treating her as completely off limits". Amd for all we know, former best friend has spent multiple years going "why am I best friends with this asshole? he treats his wife like shit when she's wonderful! if she ever dumps him I'm going to see if she'll give me a chance, and if she does I'll love her like she deserves".)