Tale of a normie that went incel

I (m23) and my girlfriend (f23) have been together for 6 years. We got together when we were still in school. She's always been what I would consider hot.<br><br> Lately I've been feeling like I've gained a lot of weight. So much so that I've started to feel like a slob, so I cut my drinking and started going to the gym. I've been going for a few months but the last week or so I've really noticed a change. I've cut 20 pounds and my abs are starting to show. She's noticed and told me she's turned on but hasn't been in the mood. She's been stressed with school so I'm assuming it's a stress thing.<br><br> So around valentines day I got some messages on tinder and I started talking to a chick. I didn't tell my gf and knew it was a bad idea but this conversation just came at the right time for me. I was feeling like a total loser and then this girl likes me, it was a bad influence. We made plans to meet and I told my gf that I'm going over to a buddies. I felt guilty as hell but we already met up and I didn't want to waste her time. We go to a bar, get a drink. We hit it off and go to her place. We fool around and she's super into me. I still feel like a piece of shit and don't even get off but it felt good to be wanted. I tell her I have a gf and can't do it anymore. She understood and said she had no clue.<br><br> I go home and feel like a total piece of shit. I'm upstairs playing video games and my gf comes up. She's in a better mood and tells me there's a show we watch together and there's a very hot sex scene. She shows me the scene and asks if I'd do that with her. I'm already in a guilt trip so I'm like "hell yeah, let's do it." We're both really into it and it feels way better than it did with the tinder girl. As we're doing it I tell her how sexy she is, how hot she looks, how much I love her, and she's loving it. She cums like 3 times which is a lot for her. I tell her how much I love her and she was the only one I loved. I think she believed me. I still feel like a piece of shit but it was worth it.