I would say there are times where you really have to bring out the man in you, I have no idea what kind of issue you had with that guy but I would suggest you to just go directly to him and do a man to man talk.. you could probably share the experience with your some friends too if you are on the right side they will support you or at least testify that you were on the right and that too is a big thing.. don't be afraid its okay.. everything will be alright.. I told you to talk to him because this is the only way to sort this shit out or else this will just keep eating your brain and he will never stop doing this by himself.. worrying is not the solution.. doing the right thing to solve that is.. Good luck, I assume you are quite young now but trust me issues like these or even bigger will come on your way throughout the lifetime and you would have to deal with them either way, stay strong be brave.. we are with you.