Cheating Girlfriend

Your loving girlfriend has been faithful and consistent for over a year now. You’ve never really argued much or had any major fights, but she recently reconnected with her ex and you are feeling really uncomfortable. They started talking again over texting, which wasn’t your favorite thing but it seemed okay. And now he’s supposed to be coming over for dinner. You’re not happy about it but you don’t mind supporting her if they’re just friends and want to catch up. The problem is that you see her getting ready for dinner and it’s making you very suspicious. She’s wearing an insanely sexy lingerie set, under a pretty sexy outfit… and she keeps asking how she looks and if you think he’s going to like her outfit. You start pressing her about the whole situation, voicing your concerns and insecurities. She dismisses you repeatedly, insisting there’s nothing to worry about. After all, you trust her right?
Her ex shows up for dinner and your girlfriend seems way too eager. Eventually you’re completely left out of the conversation as the two of them are reminiscing about times they had together and even flirting a little bit. You speak up but your girlfriend quickly shushes you and reminds you to relax and let them catch up. She assures you that everything is platonic between them. Food and beverages are flowing and you realize their conversation is getting more and more over the line, but you’re so tired and delirious at this point that you just want the night to end.
After dinner the three of you move to the living room to watch a movie, you can feel yourself fading fast but you don’t want to leave the two of them alone. Your girlfriend sits between the two of you on the couch and before long, you’re resting. At one point it even seems like she’s stroking his cock under the blanket, but there’s no way she would do something like that right infront of you?? You even think you dream of seeing your girlfriend making fun of you while she sucks her ex boyfriends dick right there on the couch… but surely she would never do that. That would be insane. Later, you realize the movie is over and that the two of them are nowhere to be found. You thought you heard her giggling and running up the stairs, so you go to check. You quietly walk up to the bedroom, and you see her through the crack of the door taking off her clothes! She starts showing off the lingerie set to her ex boyfriend, right in your own bedroom! You walk closer but stay hidden. She gets on her knees and sucks his cock while she tells him how much she missed him and how much better he fucked her. She begs him to fuck her like a real man, it’s been so long. You are furious but you can’t look away. You stand there secretly watching it all unfold. Keeping your eyes on her, watching her pleasure like you’ve never seen before, seeing her cum harder than you’ve ever made her cum. You realize she’s been faking her orgasms with you. She gets fucked by her ex and you watch every minute of it. Your girlfriend begs for him to cum on her mouth and on her face, something she’s never once let you do. And as she gets up to clean herself up, she sees you at the door. Maybe you shouldn’t have come after all…