Thank you all so much for your thoughtful responses. Being so new to this, and it being unplanned kind of threw our relationship into a bit of a tailspin. You see, the guy is very cuddly and affectionate with me and my partner and I have had a pretty rough last few years. He (my partner) has been very emotionally shut down so when he saw me enjoying another man in that way it affected him because he realized how little attention he had been giving me. I sort of felt like there was more going on there with my play friend as he was the one who initiated the beginning of it, not sure how to read it as he is dating my best friend and this could be a mess if everyone doesn't keep their heads on straight.
Since then my partner has been extremely affectionate, very loving and really taking care of me. I kind of resented it at first to be honest. After all the years of BS it takes swinging to make you notice me? Frustrating. I am trying to just accept that he is trying and maybe realized something more in the bedroom that night. We have talked and have decided to take it easy, we aren't planning any more playdates until we get our relationship in a better place.
I loved it, he was a little more apprehensive. He did say I can have all the girl playdates I want for now.. Yay me!