Naono Bohras everyday smile. http://www.mangago.zone/read-manga/everyday_smile/ first chapter, have re-read it so many times, Stoll love it
And it has a sequel too: http://www.mangago.zone/read-manga/yume_ni_tobu_tori/mf/v01/c005/
Hope you like it :). She actually has several story arcs with a similaridea of one being abandoned or one had an accident an is now having a hard Tims being deaf... Its not crazy tragic, but not nice either
read over my baggaged guy list that's exactly what the collection is for. a guy with a sad past http://www.mangago.zone/home/mangalist/72757/
http://www.mangago.zone/home/mangalist/57857/
Try the ones that have "Tragic past/Dark past" mentioned in the review.
OK I wanted to read a manga basically the main charcyer is abandoned or just has a sad and tragic poast but in the end he finds love preferably Yaoi but I like shougo to.