Yeah this is a hard one. Since he sees you hugging another male friend , and you’ve hugged him a few times, he probably views this as being ok with you. You’re going to have to use your words and have that conversation. Texting, like the other commenter suggested might be the best. Just say something like hey Ben I want to let you know I’m not really comfortable with hugging you. It took me by surprise the first time you went in for the hug, and since then I’ve felt uncomfortable with it. I didn’t know how to address this because I didn’t want to bring drama to our friend circle, but moving forward I’m requesting that you don’t go in for the hug.