I Hate Getting Jealous

I hate feeling jealous. My fiancee was taking her step daughter to drop her off at friend's birthday party yesterday and the friend's dad, who she was meeting for the first time, invites her in, gives her a tour of the house, for some reason includes the upstairs and bedroom areas in the tour when she's only there for a second to drop off her daughter. Then exchanges numbers with my fiancee, and now today he just happens to be in town (he lives away) and he wants to stop by so his daughter and my fiancee's can visit. This just happens to be while I'm at work. What are you up to, buddy?