Does NC in this context mean "no contact", as in 52 days post breakup? I don't know how long you were seeing each other, but still feeling hurt after 52 days post being cheated on, is completely healthy and understandable. It is a horrible experience that can easily take a toll on your confidence, at minimum. Hell, a ordinary, healthy breakup can do that to people. Breakups leaves scars, it breaks people. It is horrible and gruesome.

There is however nothing anyone can offer you that will make this go away, no matter much they would want to. The boring answer is to be kind to yourself, do not fall for the idea to contact them - ever again, and let time do its thing. I know it sucks to hear, and you probably heard it a lot by now from others by now, and you're already done with the first 50 days too (great job!).

I've spent the last 7 years missing my ex, and honestly I still do, but it isn't even remotely comparable to how I dealt with the first two years. The hurt you feel at day 52, will hurt less on day 365, on day 1095 you might find yourself thinking about it less and less, until you one day are ready to move on.

And in the meantime, do what ever you need to in order to keep your head above water, one day at a time.

Edit: I just read some of your post history and I read about the breakup and that your ex asked ChatGPT "how to impress girls".. I think that you will hopefully look back on this and ask yourself why the fuck you wasted your time on such a selfish little boy. Perhaps you're young, and that doesn't take the hurt away, but it means that you'll hopefully have an easier way to deal with this experience in a couple of years.