Is it true that once a cheater, always a cheater?

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I really just wanna share this one. Last night, my ex boyfriend's girlfriend (which is now, his ex girlfriend) sent me a message. BTW, before I share the actual content of the message, me and that boy have broken up for some 4 years ago already because he cheated on me for this girl. So the message goes like this: (translated exactly from Tagalog to English) "Hi. You may not remember me anymore because it has been 4 long years, but I was the girl who stole your ex. Well...I just want to say I am very sorry. This may not matter to you anymore because I know you are already happy with your married life, but I still owe you one so I am sorry. I just also wanted to explain my side of the story. He told me that he was single and that you were already with another guy at that time and I believed him. And now, he was telling this same sh*t to other girls and I broke up with him. I should not have trusted him knowing he cheated on you to be with me. Now he cheated his way again out of our relationship. If this is what you call karma, so be it. I just wanted to let you know that I admire you for being strong. I didn't hear anything from you when you were in this situation because you just decided that you will let us be happy. And now I chose to be like you. Please know that his family loved you for all those 8 years. I know they loved me too, but I guess, he really is the way he is. Again, I'm sorry. I was wrong...really wrong. " And you know what I replied? " Let me hug you, sis!"