Guys is there a certain way you kiss a girl when your feelings for her change?

I've been seeing this guy it started out just sex but now I feel like he really likes me, it was a rebound one night stand situation I never expected him to call me but he did, we've been seeing one another for about 3 months, we took a two week break when he went on spring break, when he came back things started to change, he texts me just to talk, we've gotten to this weird friendship relationship faze, even his kisses have changed, he used to be very aggressive now he gives me soft sweet intimate kisses. What's up with that?