How to know if he has changed his cheating/player ways?

Anonymous
So I've been dating this guy for a few months. And he has consistently treated me very well, wants to see me all the time, texts/emails daily, wants me to hang out with him and his friends, and is just generally very sweet and reliable. I have been keeping my distance though, and not letting my emotions take over my judgment, because he cheated a lot in the past and was a big player.

I found out a few details on my own, and he also admits to this stuff. He insists that he feels differently about me and that he never wanted commitment until he met me. He says he's tired of that lifestyle. And so far his actions have backed up his words.

I'm scared to get in too deep with him. Knowing he was (is?) a player makes it sound like he's just giving me a line and telling me what I want to hear. But he has been so consistent that I'm starting to think he might be for real? And he would have to be a pretty f--ked up person to keep up a game like this if he's just playing me, right?

So I guess my question is, do players really change like this? He just turned 25 by the way. Are there any things I should look out for that can let me know what's really happening or what he really wants? Advice from the 'players' (girls or guys) would be much appreciated too :)
Updates
+1 y
Thanks everyone for your responses. Obviously I need to be cautious. He is just so convincing and I'd like to believe he's 'innocent until proven guilty'... but I also need to protect myself.
How to know if he has changed his cheating/player ways?
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