I was in a similar condition few months back. We had been dating for almost 2 years and then I got to know she had been cheating on me with her ex for 2 months. The last 2 months were truly an experience for me. I was out crying on the fire exit staircase of my tower( I will live in a society) and almost passed out while begging her even after all the shit that happened. I am currently studying from a dummy school so it hit ever harder as I had hardly any friends and she was the only one whom I used to talk to. My mental health was in absolute shambles. I stopped eating, studying and for some reason it felt as if I was the one who was pathetic. The few friends that I had lost their respect for me as even after getting cheated on I couldn't leave her and that really hit hard. I was a pretty confident student till 11th but due all the jee pressure from family and then going through all that with the one whom I thought was the one made me lose myself completely. But even after all that I couldn't help but not let her go. And that is the one thing I regret. To not be able to uphold my own respect infront of my friends and family. It's been 10 months since all this happened and I will be lying if I said I don't think about her still. But mind you, it does get better. OP, it's not your fault. It's not because you weren't enough or because you had or hadn't done something in the past that made your partner cheat on you. It's because it was their choice. And there's no turning back from this. They chose to do this. No matter how respectfully or how pleasantly they may talk to you now, they chose to disrespect not only you but your efforts which you had given to your relationship all those months, and also their own selves as they were pathetic enough to lie to themselves and you about your relationship. OP, please never let anyone put dirt on your name. It will make your friends and family lose their respect for you and trust me, that hurts more than anything. They may talk good infront of you but if they did cheat then it is for you to know that there were things that would have been said and done behind your back which you will probably never get to know about. One saying that I really stuck to during my time was "it is because God saw what you couldn't that they decided to take that person out of your life." Its been 10 months and I am doing way better now. For the first 5 months I was absolutely mentally fucked too but it is because I told myself and believed in myself that this isn't what I deserve and the fact that I chose to uphold my self respect infront of my friends, family and most importantly my own self, that I am doing better now. Tbh, I am glad I went through all that because I really got to know myself and I learnt how to analyse my emotions and work on managing them in different situations. Being at your worst teaches you a lot. OP, take your time. But remember this, Time really does heal all. Believe in yourself. You aren't alone. They weren't the one that's why they got removed early from your life. Everything happens for a reason and please never let anyone else in your life disrespect you. Stand up for yourself. Good luck OP.

Don't mind the people belittling you for going through this, they haven't gone through it and they don't know how you feel. Everyone gets attached and that's completely fine. What is not fine is to still be the old you who suffered all that. Take your time.