
Need help finding this yaoi manga - it is a spin off from another series. The main character dresses up like a cheerleader to get his classmate's attention. He wants to be loved but thinks the classmate is in love with his childhood friend who is dating another man. It was really cute and the uke was quite tsundere

This maybe ╮( ̄▽ ̄)╭ http://www.mangago.zone/read-manga/yell/

I think is this one: http://www.mangago.zone/read-manga/kare_to_kare_no_ijiwaru_na_kyori/

Any yaoi where the relationship starts off as a bet but then it turns into real love?

This one is reaalyy good
http://www.mangago.zone/read-manga/sono_suki_honto/

http://www.mangago.zone/read-manga/batsu_game_conro/
It starts of with a punishment game and not a bet, but it's similar.
Gay uke is in love with the straight guy, who falls in love and thinks he can be a couple, first time they go to have sex the straight guy gets freaked out and backs out. They do eventually end up together though
maybe this one?
https://www.mangago.zone/read-manga/neon_sign_amber/
omg thank you that's the one