Threesome or caught cheating? [MMF]

So my wife and I went to Vegas back in early March. We hung out at the pool all day drinking. We met a slightly younger guy at the pool who offered to take a picture of us as we were selfie’ing. He was alone after his 3 other friends had left to go and get ready for a comedy show they were going to that evening. The 3 of us hang out for a few hours, drinking and drinking and more drinking (no exaggeration, lol). Once the pool closes at 6PM the three of us end up heading back to our hotel room to grab some more drinks that we had up there and hang out some more.