Why do a lot of girls put available, sweet, emotionally chill men on the backburner?

I reciprocate the attention I get. We have fun, but then, after a while the energy dies down. I spoil like milk, put me in the fridge if ya busy lol, but don't leave out on the counter. It happens everytime I open up and leave myself a little emotionally vulnerable. And then all the sudden, I'm not sexy anymore, but I'm seen as someone they might marry/f*ck if no one else comes along. Do I really have to be the one to break hearts? To I have to be a little of a closed off asshole to keep girls interested?
Why do a lot of girls put available, sweet, emotionally chill men on the backburner?
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