sorry, what does 'mutual pining' mean? great list btw!

Mutual pining is when both of them like/love the other one but doesn’t believe that the other party is interested in them, basically they both think they are unrequitedly in love while it is actually requited (it happens generally in the dumb naive idiots in love trope lol so I love it)
Also, thank you~ hope you’ll enjoy the list :))