How to ask my girlfriend for a friend for casual sex or an open relationship?

Tyler273
It's a relationship question. I'm in a relationship and love my girlfriend, but sex with her isn't good. I want to have a friends with benefits or an open relationship of sorts. How do I bring this up to her?

I have asked her before ages ago, and the answer was no and she ended up crying as it makes her feel like she's not treating me correctly or that I am going to leave her.

When you answer the question, please don't say break up. I was constructive answers not destructive ones.
How to ask my girlfriend for a friend for casual sex or an open relationship?
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