Will a cheating guy change?

Will a cheating guy changes his ways once he finds the girl that he wants to be with for the rest of his life.

for example: I know this guy that is dating this sweet and nice girl & he promised her he will not cheat on her and that he tells her everything he is very honest about everything such as if a ex of his tries to flirt with him he always tells the girl that he loves that his ex tried doing that and he would always call me to tell the girl he loves right away

do that mean a cheating guy can change into a better man with the help of love for a girl that he truly loves and wants to be with the rest of his life?
Will a cheating guy change?
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