My boyfriend told me he likes how I look much better without makeup and that makeup looks fake. And basically that it's bad on me, I guess. He told me I'm pretty without it and asked me not to wear it.
he wouldn't be with you if he didn't find you attractive. what he's saying is, he likes you the way you are, naturally, without anything added. Sounds like a compliment to me. He probably didn't know how to say it that way. most guys don't like to sound cheesy. If your pretty without make-up, to him, he loves you just the way you are, so give your man some lovin.
Personally, I don't see that as an insult. Just means he likes you for you, you don't need to try to make yourself look better for him. He already thinks your attractive. Seems like a pretty nice thing to say in my opinion!