Guy who is in a open relationship wants to date with me?

Hello, there is a guy who is interested in me for a month he was trying to arrange a date for a couple of times and finally we went on a date. It was innoncent and nice date but that guy is in a open relationship. He is very gentle to me. I really dont know what to do? Need some advice.
Guy who is in a open relationship wants to date with me?
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