What does it mean if a guy warns you?

Anonymous
I had some encounters with two different guys, both of which frustratingly ended after a short time. Both guys eventually knew me to be widely admired by guys and when I mentioned me being with other guys they warned me to watch out because guys talk about the things they did with woman.

I know I should watch out - but why do these guys care? Is there any meaning behind this? Could they be jealous, trying to discourage me? Are they just being nice? Are they being selfish? Part of me thinks they're jealous, but that could just be my ego talking. What do you guys think? Guys: when would you warn a woman not to do many encounters because of guys that talk
What does it mean if a guy warns you?
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