<human>: Provide a brief overview of the text.

I've known this guy since I was in high school, he's my best friend and the only one who has been through everything with me. I've been in two serious relationships since meeting him and he's been in one. I've had a few one night stands with random people - it's not really my 'thing'. He's had over 40.. 

As best friends, we know the good the bad and the ugly about each other. I'm okay with how he is, it's just him I guess. He's not the type to treat women like a game, his insecurities just lead him to always seeking sex to make up for what he thinks he is missing in his life. Over the past 2 years we've been much, much closer. Chemistry started to spark and 6 months ago we've admitted our feelings towards each other seem a bit more than friends.

We have since decided to take things slowly because it could just be passing lust, neither of us really understand what it is we feel for each other. Recently though, we have both talked and want to turn this into some form of relationship; there is no reason we can think of not to give it a try. I've been seriously hurt in the past by a cheater, it's the only thing in a relationship that I can't deal with. He knows this, he's seen what it did to me.

Yesterday we talked and he told me he's never felt like this before and it's scary. He says he wants to commit and he wants me more than anything but he is so scared of the rapid lifestyle change from sleeping with one person to the next and then suddenly sticking with one. I appreciate so much that he doesn't want to take a step forward without being sure, but I feel so helpless...how will he know? Will he ever know? I just need advice from anyone who has been the 'game changer' before..
<bot>: Dating my best friend who used to be a player. We both want a relationship but he is worried about cheating. How will he know when he's ready to commit?