Conflicted Thoughts on My Recent Playdate

So, I've been in this open relationship for about six months now, and it's definitely brought up a lot of interesting feelings. Yesterday was one of those days where everything felt... different. I had dinner with a new friend (let's call him Alex) who my partner knows and is okay with us hanging out outside the relationship. We ended up at his place after dinner, and things got pretty heated. But it wasn't just about physical stuff, I found myself really connecting with him on another level too. It was intense, and I couldn't help but feel a little guilty about how much I enjoyed spending time with someone other than my partner. Now I'm here, trying to figure out if what we did yesterday was more significant than it felt in the moment. Was it just some exciting fling that will fade away, or could there be something deeper going on? It's confusing because I still care about my partner a lot too. What do you guys think? Have any of you been through this and found a way to move forward while respecting everyone involved? Would love to hear your thoughts.