Friend lost 100lb - negative personality changes

(Using throwaway because he's on reddit, although not sure if he's on this sub)

I'm hoping some people here can give me some insight.

One of the guys in our friend group (let's call him J) has lost 100lbs, and he's rightfully proud of himself, and now has a lot of confidence he didn't have before. The problem is, maybe too much. He's become an entirely different person, and I'm not sure it's a good thing. Some examples:

• Our friend group (5 people) are all late 30s/early 40s. Since J (42M) has lost the weight, he's dressing like he's a 20something model (he's not). He thinks he's a 10, when he's probably a 6 since the weight loss.
• We used to banter a lot, but J was always the quietest one. Another guy in the group (we'll call him M) started needling J about something. Usually J took it quietly, but not any more. J started saying shit back to M, and M said something to the effect of "you need to remember your place". J lunged at M, and it took two of us to pull him away. J started yelling back "I decide where my fucking place is".
• He's been a lot more judgmental about other people, especially those who are overweight. Where he used to be quiet and nonconfrontational, he now looks to push the situation.
• Probably the most concerning one. I'm worried that he might be cheating on his wife (he's married 4 years) or looking to do so. Even when he was single, he was too shy and timid to talk to women. Now, he's flirting with half the women he sees. He doesn't always wear his wedding ring out either. I remember one time when he was still heavy, the he told me how happy he was that she was in his life. He said that he had resigned himself to the fact that nobody else would want him.

I had a talk with him about his personality changes, and he was a bit odd about it. He said things like "the old me is dead. I killed him.", and going on about how he "missed out on so many things in life because I was a fat fuck and now I'm gonna make up for all that lost time" (his words verbatim).

I really don't know what to do to get him to come back to normal.

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