I think I'm catching feelings for my best friend

So, I've recently started catching feelings for my guy best friend. He and I are incredibly close and we're also extremely comfortable with each other. He's always been there for me and he's one of the main reasons why my ex and I broke up. My ex was jealous that my friend and I were so close and wanted me to choose, I refused. People are always joking and saying that he and I look like a couple and that we're dating. I've realized that I've liked him for a while and I've been in denial about it. He's also the type of guy who doesn't do relationships, at least not since we've been friends (a couple years).I'm scared to lose my friendship with him, but at the same time I want to come clean. Any advice ladies??