He is not doing this on purpose. It’s just the law of attraction and he is attracted to you big time.
Whenever he is close to you, he can’t help but lean to you because he wants to be with you and his body wants it, too.
He will never ambush you and capture you, so you don’t have anywhere to go if you don’t want him to lean to you.
He will always leave you a bit of space for you to move back if you feel uncomfortable.