Background
I have a friend who I met in college (we're both 19 year old males) and we attended the same classes together. Throughout the semesters he was a little "touchy-feely" (e.g. putting his arm around my shoulders in the bro-like fashion more than a normal friend would) towards me. I am sure that he is not gay and he does not have any interest in being anything more than a "bro" to me, thus the most likely reason that I attribute his actions to is that he just has the mentality of a 12 year old and thinks that doing these actions are perfectly normal. (This is just what I tell myself in order to "accept" the fact that I'm being touched by him, however I'm feeling increasingly uncomfortable as the days go by, hence this question)
After we graduated from college, we meet up lesser. However, I am still uncomfortable with him being "touchy-feely" with me when we hang out at the mall.
Question: How do I tell him that I am uncomfortable when he "touches" me without offending him or making our friendship awkward?
Additional Notes
- We are both straight males.
- I have a girlfriend, he is single.
- He does not touch me in a way that suggests he wants to make advances with me.