After watching the movie, I tend not to over think it.
Is a basic Beauty and the beast in sci-fi.

I say Kylo isn't lying and Rey knows it. < Yes she is nobody

The next episode is either JJ turns Kylo to Ben in the end, or simply the end of any Skywalker line. As Luke is dead, I actually can't see any much more hate from Kylo and he will soon let it go as he isn't really angry with Rey or he would have killed both Snoke and Rey in the last Jedi.

Obviously if Leia has the chance to face her son, this would be flip of the coin whether Ben will turn back to light or fall into darkness.

Too early to speculate at the moment as I think JJ either starts reading feedback on Last Jedi and take on board what the fans would have love to see for the next episode or just finish the chapter.