Search Results: keeping a relationship

So long story short :
Last month, me and my girl went to a party hosted by one of our friends. She went on and sat with a bunch of her friends and i sat with a bunch of mine. Then, one thing led to another and i regretfully cheated on my girlfriend with a girl i always had a crush on. Now, a month later, i feel like our relationship has become frail as if she realized i am keeping a secret from her. I feel tired of this relationship and i decided to take an action. So the question is :
Should I break up with her and save her the trouble of knowing what i did (which i know will break her heart) or should i just tell her the truth and eventually get dumped by her (same outcome) ?

First of all, I'm not much of a talker. And she ain't either. We both understood that when we started the relationship and was comfortable with it.
But after 3 months into our relationship, the lockdown started and then we had to stick to texting and rare video calls.


I used to find topics to talk about, but now, even I'm having a hard time making a conversation with her. And now, i feel kike she's bored too. Coz she was the one that always used to text and video call me first.
But now, she texts and dissapears, then comes back at midnight and then we talk non continuosly till 2am or something.
I even noticed that there isn't video calling anymore. Especially no I love you or i miss you.
I understand that she's not that kinda girl, but the thing is, she used to say all those things, and now when she suddenly stopped saying it, I don't know... Feel so sad thinking bout it. I talked to her bout it and she said it's nothing like you think. Just coz i don't say those things, doesn't mean I don't love you and all.
But for some reason, it's a bit hard. And I can't make her say those words or anything.

We have fights here and there, coz we are both short tempered and things explode. Is that why things are dull? Is she keeping a safe distance from me and not talking much, so that she can get back to normal?

Is this normal in a relationship?
What have you guys done to tackle such instances?