Responses
All of these are BLs, by the way.
http://www.mangago.me/read-manga/hakwonmul/
http://www.mangago.me/read-manga/from_points_of_three/?av=2
http://www.mangago.me/read-manga/jazz_for_two/?av=2
http://www.mangago.me/read-manga/love_is_an_illusion/?av=2
http://www.mangago.me/read-manga/all_about_lust/?av=1 (Side character isn't particularly jealous but..)
Sorry if you weren't looking for BLs.
I love bl . I love shoujo too but I love bl more. Thank you very much
Somehow I'm in the mood to read stories with jealous side characters. If you guys have any suggestions I would love to know them