Why do nice guys bore me?

I always get asked out by nice sweet guys, we get on and I find them physically attractive but I can't fancy them, they're too sweet so I friend zone them. I just can't see them sexually. I always seem to be attracted to sexually sadistic men who don't necessarily treat me bad but always end up being quite self centered once I get to know them properly and I get hurt when they don't seem to care. I want a sweet guy but i'm never attracted to them. What's wrong with me?
Why do nice guys bore me?
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