
RECOMMENDATIONS PLs
like a sad yaoi or shounen ai where they break up or dont even end up together, but not like one of them dies... shit like that you know

spoilers
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http://www.mangago.zone/read-manga/because_of_you/?av=1

got a oneshot here
http://www.mangago.zone/read-manga/kyoushitsu_no_yugami/

A yaoi manga(s) where it doesnt work out between the two of them, they breakup etc.

Do you mind if they break up and reconcile afterwards? Or are you looking for those break up and that's the end of their relationship? Here's a mix of those two types (so you won't get a spoiler ;)) :
http://www.mangago.zone/read-manga/tatoeba_konna_koi_no_hanashi/
http://www.mangago.zone/read-manga/escape_journey/
http://www.mangago.zone/read-manga/momentum_park_ji_yeon/?av=1
http://www.mangago.zone/read-manga/back_in_time_to_you/
http://www.mangago.zone/read-manga/life_senjou_no_bokura/
http://www.mangago.zone/read-manga/let_dai/
http://www.mangago.zone/read-manga/doushitemo_furetakunai/
http://www.mangago.zone/read-manga/sojou_no_koi_wa_nido_haneru/ (has a prequel Kyuuso Ha Cheese no Yume Omiru)

yaoi where guys are actually switching

If you mean like reversible, neko x neko is good
http://www.mangago.zone/read-manga/neko_x_neko/

shounen ai or yaoi where the boys are younger than 18
(● ̄(エ) ̄●) ヽ(`Д´)ノ(〜 ̄△ ̄)〜

http://www.mangago.zone/read-manga/musubenai_necktie/
http://www.mangago.zone/read-manga/shitteru_yo/
http://www.mangago.zone/read-manga/dounimo_nannai_soushi_souai/
http://www.mangago.zone/read-manga/majouu_school_days/ (Damn dat butt)
http://www.mangago.zone/read-manga/bukiyou_dakedo_daisukisa/
http://www.mangago.zone/read-manga/hitorijime_boyfriend/
http://www.mangago.zone/read-manga/deri_pocha_yajuu_no_h_na_gohan/
http://www.mangago.zone/read-manga/kiyona_yubisaki_bukiyona_tsumasaki/

give me some age gap yaoi or shounen ai
where one guy is in his teens and other guy is over 20
smthing like hitorijime my hero or shensheng

This one is seriously underrated! http://www.mangago.zone/read-manga/muchuu_no_hito/
need more manga like Love for Sale
with some service tops please!
or some yaoi maga that are not over sexualizing gay relationships