Why do men put down other men who are successful with girls?

I have usually been the one keeping to himself and not pursuing any women. Recently that changed and I have been far exceeding the success I anticipated having. With that said, I’ve noticed a lot of guys (random or not) suddenly started putting me down or trying to “out” me often in front of the girl. Why is this? Is it a jealousy thing or just basic competition?
Updates
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Updating since there seems to be a misunderstanding. Y’all are the only ones who even know I’m thinking this. I haven’t bragged or even looked at half of these guys.
Why do men put down other men who are successful with girls?
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