Why am I only hook up material?

This guy, who has a long-term girlfriend hit on me. I obviously, rejected him. What makes me only good enough to hook up with and not worthy of an actual relationship? I don’t dress in a manner that is suggestive or shows a lot of skin. I’m not constantly flirting with guys. I’ve never been one to have sex outside of a relationship. I don’t really go out to clubs and parties often. I’m career and goal oriented. I’m smart and ambitious. Why am I not worthy of a serious relationship? I honestly, just feel like giving up and staying single for the rest of my life.
Why am I only hook up material?
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