You've been dating a girl for a while, and things are going ..

You've been dating a girl for a while, and things are going fairly well except for the fact that you don't seem able to please her sexually: you always finish too soon, and at times, that thing between your legs doesn't even get up at all... not only that, you seem to even lack the initiative to learn a few skills to give her what she needs in other ways... One day you got up to take a shower after 3 or 4 minutes of meager missionary action and you're pretty sure you heard the buzzing of her wand coming from the bedroom and some muffled sounds of your girlfriend finishing what you barely started. But since you're an entitled, average man, you don't worry about this at all, until the day she shows up to a lunch date all flustered and nervous. You ask her what's up and after some hesitance she confesses to you that she came across a very sensual and intriguing woman at work, she tells you how they've been texting (and sexting) for a week or so before she found the courage to actually go on a date with her, and at this point you stop her, overwhelmed by utter confusion, intense jealousy and genuine arousal, and ask her to tell you exactly what happened during the date. She gets a little squirmy and hesitates again: 'I thought I'd spare you the details cause the truth might be a little brutal to hear, baby' she whispers, as she glances around to see if anybody is listening. You insist and even make a few jokes on how it turns you on to imagine her with another woman and so on. At that point, she takes a deep breath and goes: 'Well, she had this huge strap-on cock, and she just fucked me for hours, she went on for so long, I lost track of time, and I ended up coming multiple times, it was incredible, my whole body was shaking! I didn't even know that was possible, honestly. You know how sometimes when me and you are at it I just can't reach an orgasm?' she stops for a second and brings a hand to her mouth, struggling not to laugh - 'I'm sorry baby, but I don't think I could bring myself to have sex with you again after what she did to me. I'm breaking up with you.' You look at her walk out in complete silence, looking at the ground, knowing that not only you'll never see her again: you also won't be able to look at yourself the same way from now on. There's no escape, now you know how irrelevant you are and there's no turning back. From today onwards, this notion will accompany you for your whole life.