What should I do if I want to get to know this other guy but I’m still in a relationship?

I’m in a long term relationship for a couple years now but things haven’t been great all the time. I recently met this guy and he is very interested in me. Would it be okay to get to know him as a friend only? Or would that be wrong?
What should I do if I want to get to know this other guy but I’m still in a relationship?
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