I feel horrible about myself.

Not your usual post, maybe someone can empathize with me here. I feel horrible about what I’ve done. I thought that having multiple women would make you feel empowered, but it has made me feel like a piece of shit. I guess you could say things didn’t work out between me and a girl I was seeing for a couple months. I found out she was still looking for people on dating apps while we were seeing each other, so I said my goodbyes and blocked her without hearing her side and hooked up with someone else less than a week later (last night). I don’t feel good about myself, I feel gross and defeated. I banged this girl no more than 3 feet away from a birthday card I was supposed to give someone that was tucked under my desk. Even though the other person technically wronged me, it still feels like I did them so wrong by moving on so quickly. Maybe I need to walk away from this whole thing and get my head right. As my night was coming to an end yesterday I couldn’t help but wonder how in the fuck do some people do this?? How do you just mercilessly move from one person to the next without feeling anything? I just couldn’t get the other person out of my head as I was intimate with someone else, it felt like I committed a murder that I can’t tell anyone about. Not a good feeling whatsoever.