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This guy friend of mine and I used to be pretty close in college/HS, back then he was very good looking, and we both really liked each other, hooked up did oral but didn't have sex.
Went our own ways as uni started, lost contact, then he found me and started talking to me again and recently we started sexting. His uni isn't too far away from mine so I thought there could be a chance between us. I do really like his personality, but then I saw the recent pictures of him, he doesn't post much on social media so I assumed he still looked the same way as he did before. But he's been putting on the pounds, not shaving his face, and honestly he just looks homeless and just not attractive anymore like he doesn't take care of himself at all.
In the meanwhile I spend the time at the gym, take care of my body and my appearance.

I was just invited to a party that he's also going to attend, he thinks that something is going to happen between us there but now I don't know because I've just lost the attraction. I don't know what to tell him that won't hurt his feelings, and I don't want the party to turn awkward because I told him I'm not attracted to him anymore, so what do I tell him?