How do I let him down easy?

So met this guy online. He seemed cute and was so nice. Not like other jerks online. We started talking and I fell for him a bit and started saying things like "hey gorgeous" etc. his pics he had up must have been from like 5 years ago because he shared a few pics of himself recently and I was like ugh no way. He's extremely over weight and doesn't even look like his pics he has posted. I feel bad now. He wants to plan a trip to come see me and has told his friends about me, but it freaks me out to envision a relationship with him. How do I let him down easy! Help..
How do I let him down easy?
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