Break the touch barrier.
Once you get closer to the guy, don't be afraid to gently hit him on the arm or shoulder if he's said something funny. You can make physical contact if you're teasing each other, or even give him a big hug when you meet up, if it feels right. Breaking the touch barrier will help him see that you want to get closer to him.
Just make sure that he wants to touch you too and that you're not making him uncomfortable.
If you're getting close with the guy and just came back from a run together or some other form of physical activity, offer to give him a massage. If he likes you, he'll say yes, and he'll start to see how good you can make him feel.