How has opening up been weaponized against you? Was it worth it?

I saw a post here about about a woman trying to get a man to open up, and most of the men there remarked how those feelings were later weaponized against them. Wouldn't that just be the ultimate qualifier for if someone could be trusted? That's the problem of the one who abused said trust, not the one who gave it.

I don't believe my feelings or emotions have ever been weaponized against me in any meaningful way outside of long term manipulation by one previous partner. But even then, in my mind, that's the only way to determine if someone would be worth trusting. Because I extended a facet unique to myself.

Maybe I've expressed desire too early when dating and that got potential relationships killed. Or I trauma dumped while high af playing a video game and wasn't being considerate of someone's emotional wellbeing? Either way, if anyone's said anything to me with the purpose of harm, why does it even matter?

I'm a 28m, maybe im just lacking in experience on the matter but thus far in my life, unless that person has verbally rejected my request of expressing an emotional weight, or I feel it may be too "heavy" for them, I see no reason not to. This is possibly tied to the concept of "not letting externals/others get to me". Am I viewing things incorrectly?

Edit: this comment feels reasonable

this comment is amazing as well

Some other gold nuggets are there if you look.

A lot of you sound like you never recovered from being hurt once you opened up and never learned how to properly set boundaries or communicate these things. I'm sorry. I hope you find it within yourselves to learn were social creatures. It's how we erased the Neanderthals.