i have read Ntr (and its a good genre of it own)but it seems that all that i have read there is no conclusive ending except for the fact that the girl is stolen.What i was wondering is if there is anything that has the male getting even with his cheating g/f. I have read and watched some netori but nothing that can put my mind break at ease for reading NTR.

Nope, if there is a ntr hentai with male protag gets even that's perhaps 1 from 10000.
Buuut, you could look into [Nagare Ippon] Gibo, the stepson gets even. And we can pray for the ending of Boku no Yayoi-san gets like that. And i read a oneshot, but can't remember the name, where the cheated husband trains and breaks his wife, and at the end came the man who the wife cheated with.