Holy shit, can't this guy stop and think for a little bit. Nothing makes sense at all in this situation.
(Revenge on what? Why? How? Will he just go ruin their relationship or something? If he do that, then what come after? And why would the childhood friend help him? Does she have some grudge...
This is why Maomao doesn't think too highly of Jinshi. The poor guy is always being misunderstood(though it's never anyone else's fault. Whenever something like this happens, it's always Jinshi shooting himself in the foot because he doesn't understand Maomao's autistic mind)