Would you start an open relationship?

Would you start an open relationship to stay with your partner of 5 years, if that's what he wants? I don't think he's willing to stop flirting or texting other women, and I'm sure he wants to sleep with them too. I'm trying to figure out what's reasonable and what boundaries people actually hold. Would you try open, just deal with it, or would you leave? Why? I want him to do what he wants. What he wants hurts me.

Would you start an open relationship?
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