Here are a few, not sure how long you want the crush to have gone on for, though, so some may be less applicable. But at least the first two or so should apply!
http://www.mangago.zone/read-manga/koi_nanka_shitakunai/
http://www.mangago.zone/read-manga/itsuka_no_koi_to_natsunohate/
http://www.mangago.zone/read-manga/kikoeru/
http://www.mangago.zone/read-manga/sono_suki_honto/
http://www.mangago.zone/read-manga/kakkou_no_yume/
http://www.mangago.zone/read-manga/eigyou_nika/
http://www.mangago.zone/read-manga/suki_ni_nattara_dame_desu_ka/
http://www.mangago.zone/read-manga/hatsukoi_kazuki_rai/
http://www.mangago.zone/read-manga/yasashii_pantsu_no_nugasekata/
here are recent favourites! :>
http://www.mangago.zone/read-manga/sayonara_game_minaduki_yuu/
http://www.mangago.zone/read-manga/dear_signal/
omg thanks so much!
hehe ty!! <33
does anyone have any yaoi recs about long-time crushes? I prefer that they end up together in the end too LMAO