Should I go on a date with a guy and his girlfriend?

LilyoftheLake
Long story short, I've been single for a few months and got matched with a pretty nice guy. We talked for a while until he finally mentioned that he had a girlfriend. I went to block him, but he insisted that she knew and that they were looking for a unicorn (apparently a legit thing). He asked if I would go on a date with THEM, as in both of them. I'm not against the idea, but it seems kind of suspicious and strange to me. What should I do?

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Should I go on a date with a guy and his girlfriend?
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