Once a cheater always a cheater or making a change?

So I'm plagued with the question whether or not my ex can change, I'm trying to forgive, not willing to ever take him back but it hurts thinking he could change for the girl he cheated with. I gave him several chances before I had confirmed proof of his lying and cheating and he continued to overlap me and this girl right up till a few days before I got the proof. Since then he's still been with her and seemed like he was making a sincere effort, not posting on Facebook and liking other women's photos, then he resurfaced telling me he missed me, thinks about me everyday, and even met up last week, we did not have sex but lots of kissing and he wanted me to spend the night, so does that prove he can't change or is unwilling to change? We were opposites, she's much more suited with common interests and style in appearance, so if she's the one, why is he making out and messaging me?
Once a cheater always a cheater or making a change?
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