Should I feel hurt by this? makes me think how many other guys think like this.
Most Helpful Guy
It means he's feeling insecure about himself in one or more areas and doesn't think he'd be able to make you attracted to him in the long run. He's thinking that you could do better than him (better looking man, richer man, more confident man, more stable man, etc.) and would upgrade to a new guy if the opportunity presented itself. He told you that to protect himself from you, because he probably thinks you'll move on easily given that he thinks you have way more options than he does, or at least perceives to have.