Am I wrong for having feelings for a coworker while in a sexless relationship?

So I have a girlfriend of 5 years, she's always been good to me and I love her very much, but we dont get sexual, have not for about 3 years. Its dumb but im too big for her. She ends up bleeding etc and sometimes the hospital. She's a very good person though.

The problem is that there's this girl at work, she's super pretty, funny. All the things guys like about girls and we get along really well. We talk about less then pg related things and we always have a good time. I know the whole dont get interested in your work friends. But we click so well. Am I wrong for thinking about the girl at work? She's into me and im into her, but I would never do anything that stops my current relationship. I dont want to completely reject the girl at work, she's a good friend too and it would make working kind of a nightmare if its gonna be weird all the time. Got any advice?
Am I wrong for having feelings for a coworker while in a sexless relationship?
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