Responses
http://www.mangago.me/read-manga/i_wanna_die_before_i_m_30/ not really a healthy relationship but they all love and do each other
http://www.mangago.me/read-manga/satou_kun_ni_wa_kanawanai_sachimo/ this one is short but its amazing
http://www.mangago.me/read-manga/choco_strawberry_vanilla/ also not healthy but they love each other in their own ways

are there any manga where the 3p is actually 1+1+1?
i cant stand when its two people in love with one person, or one person who loves two people_:(´ཀ`」 ∠):
where’s the good and healthy 3p where all parties love each other,, am i asking for too much??(● ˃ロ˂)੭⁾⁾