How come my ex blamed me for him being fat when we were together now that he's single he’s sloppy looking and fat?

Ran into my ex at the batting cages, I’ve been stressed with court stuff and decided to hit some balls to relax. While I was hitting I saw him and he gained a ton of weight and had long hair/wrinkled stained clothes. Now that he’s Single, was unemployed, not a full time dad, and lives alone shouldn’t he have his life the way he wants it? I’m in a much better place and taking better care of myself being a full time mom.

How come my ex blamed me for him being fat when we were together now that he's single he’s sloppy looking and fat?
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