How likely is it that my crushs boyfriend cheated on him?

My friend "Eugene" (coworker) is a lot of fun he's very sweet, funny, and also very sexually attractive to me... He started dating a guy "stephen" (also coworker) and im very excited for them, right? Well, Ive noticed that every single day, "Mike" (also coworker) is *always* extra friendly to Eugene and is always doing favors for him. I mean literally every day, hes *so* overly nice to him. He and Eugene also CONSTANTLY go for walks outside or go and get food together.<br><br>The other day, Mike and Eugene were talking about food and Mike said "I've got a huge burger waiting for you".<br><br>I know that Mike and Eugene are both gay, but they both are in relationships. The way they talk to each other is the way I talk to Eugene too, super friendly and flirtatious. <br><br>I really want Eugene to be happy, but I kind of feel like they may be having an affair.. I dont know if it's happening or not but as long as theyre happy, they can do whatever they want.