Not psychological, but some of my faves.
http://www.mangago.zone/read-manga/yume_no_kodomo/
http://www.mangago.zone/read-manga/komatta_toki_ni_wa_hoshi_ni_kike/
http://www.mangago.zone/read-manga/afuresou_na_pool/
http://www.mangago.zone/read-manga/blue_sky_complex/
http://www.mangago.zone/read-manga/breakfast_club/
http://www.mangago.zone/read-manga/hanaya_no_nikai_de/
http://www.mangago.zone/read-manga/yamete_kudasai_mabushii_desu/
http://www.mangago.zone/read-manga/sayonara_heron/
http://www.mangago.zone/read-manga/nanadome_no_gomenne/
http://www.mangago.zone/read-manga/endou_kun_no_kansetsu_nikki/
http://www.mangago.zone/read-manga/yamada_to_shounen/
http://www.mangago.zone/read-manga/hello_again/
If you have a high tolerance for messed up stuff (I am guessing you have) then you might like this -
http://www.mangago.zone/read-manga/zankoku_na_kami_ga_shihai_suru/
I personally think the portrayal of this story was quite realistic. The art is old but what it lacks for in the art & BL fluff department makes it up with the mind blowing story & character development.
Can anyone recommend some yaoi or shounen-ai with a realistic syoryline?
(bonus points if its psychological)
thanks!!