I (23F) have a longtime friend, Jack (23M), who’s been in a committed relationship for over four years. He and his girlfriend are very solid — communicative, healthy, and honestly couple goals. I also really like his girlfriend; we’ve gone on trips together and she’s genuinely kind, intelligent, and fun to be around.

Jack and I have stayed close over the years. When he visits our hometown, we always hang out — usually in a group, but sometimes we get moments alone. Recently, during one of those times, he told me that he and his girlfriend have decided to open their relationship. Nothing has happened with other people yet, but they’re both on the same page about wanting to explore.

That same night, I felt a shift. He was looking at me differently, made a slightly flirty joke, and invited me to dinner with his family — something he’s never done before unless it was a group thing. When we were alone for a bit, he asked what I thought about open relationships, and it definitely felt like the conversation was going somewhere… before our other friends arrived.

Now I’m stuck wondering: would I be the asshole if something happened between us?

I’m not planning to throw myself at him, but I also won’t pretend I’m not interested. He’s attractive, kind, and we've always had great chemistry. But I also don’t want to hurt anyone, especially his girlfriend, even though they’re ethically non-monogamous now. Part of me worries I’m just lonely and craving intimacy, and this might be a bad emotional decision.

So Reddit — WIBTA if I slept with him? Or would it be okay, as long as everything is above board?