"My darling signed in" - online friends to lovers BxB - http://www.mangago.zone/read-manga/my_darling_signed_in/
"Samishigariya no Love Letter" - plays into the idea of unkown soulmate being right next to you BxB - http://www.mangago.zone/read-manga/samishigariya_no_love_letter/
as much as I want to thank you, I HAVE ALREADY READ ALL OF THESE┗( T﹏T )┛
(╯°Д °)╯╧╧ ahh sorry lol.
How about these ones? uses the online friend theme
http://www.mangago.zone/read-manga/distopia_mikansei_na_sekai/
http://www.mangago.zone/read-manga/kimi_to_no_dogfight/
http://www.mangago.zone/read-manga/fantasia_world/
THANKSS
A similar concept such as http://www.mangago.zone/read-manga/online_game_nakama_to_sashi_off_shitara_shokuba_no_onijoushi_ga_kita/ That said, basically soulmates who are right beside each other irl yet oblivious about it (⌒▽⌒)