NTR games/story don't punish bulls and specially the GF/Wife. Some endings will let the husband/BF a little breather like showing they are TRYING to move on while implying the wife is very happy with the bull. Very very rarely there is btb endings. Though sometimes manga's tries this but most times they're very short.
Endings mostly fall in these categories: happy cuck, forced cuck, oblivious cuck, lonely cuck and rarely Trying to move on sad lonely man. From FMC ending: Happy couple (very early ending), Happy bull couple, Happy bull couple with a cuck, Happy cheating wife, Happy whore with successful life.