Friend Zoning The Nice Guy

I have a friend that I've known for 6 years. He's a great friend and a nice guy.

My husband and I recently separated and nice guy has been talking to me. He told me that he has been interested in me a while and wants me to consider dating him when I am ready for a relationship.

The only thing is that while he's a nice guy and from his past relationships, I can tell he's a good boyfriend, I just don't see him as more than a friend. I'm not physically attracted to him whatsoever. And I know that sounds awful and makes me seem like a bitch, but I just have no physical attraction to him. And while it's not the most important thing to me, I think having some sort of physical attraction is important.

It makes me feel like a terrible person though. Has anyone been through this too