Is it bad for me to consider leaving my husband because of his lack of personal maintenance?

When we were dating when we were 19, he was clean cut and fit but as soon as we got married in our early 20’s and moved in together, he got comfortable and seemingly gradually stopped caring about his looks. I would occasionally nudge at it but he’d brush it off. Now we’re passing 30 and I don’t remember the last time he has a proper haircut. He’ll occasionally get a trim but otherwise he’s looking basically homeless and showering every other day. It got to the point where I got uninterested in sex and I had to confront him about his maintenance because of that and he says “I can’t look like a model for you all the time, I’m gonna get old and get out of shape” but all I ever wanted was some level of maintenance and he has none.

We’re pushing 10 years of marriage and I love him, I can’t imagine being without him, he’s the only guy I’ve ever had an emotional connection like this with, but I have to admit I’ve thought about other guys because of this… Is it bad that I feel this way?