Can you recommend for me a good yaoi manga about one side love,,Thx :)

There are tonnes! Of course, the thing about the romance genre is that the one-sided love doesn't usually stay one-sided, so I'm not sure if that's what you're really looking for. In any case, here's a few of my favourites:

Suzuki Tsuta:
http://www.mangago.me/read-manga/sangen_tonari_no_tooi_hito/

Tsunoda Ryouku:
http://www.mangago.me/read-manga/en_wa_ki_na_mono_aji_na_mono/

Tenzen Momoko:
http://www.mangago.me/read-manga/wonderful_days/

http://www.mangago.me/read-manga/lotus_eater/

Asou Kai:
http://www.mangago.me/read-manga/like_that/
http://www.mangago.me/read-manga/sorenari_ni_shinken_nandesu/

Ogawa Chise: http://www.mangago.me/read-manga/lover_s_position/
http://www.mangago.me/read-manga/owaranai_fukou_ni_tsuite_no_hanashi/

Nishimura Shouko:
http://www.mangago.me/read-manga/doubt_nishimura_shuuko/

Sakuraga Mei:
http://www.mangago.me/read-manga/mujihi_na_otoko/

Nanameguri:
http://www.mangago.me/read-manga/koi_o_kataranai_kuchibiru/

Minasa Masari:
http://www.mangago.me/read-manga/lover_s_position/

http://www.mangago.me/read-manga/toiki_yori_mo_yasashii/

Sakuragi Yaya:
http://www.mangago.me/read-manga/renai_kyoutei_nukegake_nashi/

Fujikawa Ruri:
http://www.mangago.me/read-manga/dye_of_love/

Hidaka Shouko:
http://www.mangago.me/read-manga/hatsukoi_no_atosaki/

Ogeretsu Tanaka:
http://www.mangago.me/read-manga/renai_rubi_no_tadashii_furikata/

Don't know why Minasa Masare's Lover's Position link got plunked under Ogawa Chise, but that's not where it belongs ... *sigh*

Thank you