Fiancé cheat

Me and my partner (fiancé) were going to get married this JUNE. I went through his phone and saw some messages of him and this girl lets just say it was very detailed. I didn't have feelings of him cheating on me nor did he show any signs, we were happy but something in my gut told me to look. I did look and saw what I saw. Of course I ended it with him being that this isn't the first time he's been unloyal. We been talking and he said he doesn't want me to get back wih him because he wants to fix himself and make things right. He said "I want to be the man you deserve". So my question is can a man ever stop cheating!? 

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