Dating implies that dating process of elimination, dating many people to narrow it down to the one who you want to then start seeing more seriously.
It may be nothing but I wasn't sure if there is a distinction.
He lets her into his world and shows some level of vulnerability. Men aren’t used to opening up and showing their emotions and they are much more selective when it comes to letting people in.
When a guy opens up to you, when he shares his dreams, his fears, his hopes, his wishes, his motivations, etc., he is investing in you.
By investing in you, he is committing himself to you.