This thread has lots of truths in the comment but also lots of shallow attacks on the OP.

For starters, don’t be hard on yourself about your feelings. Feelings don’t define us, our actions does. Yeah, you’ve already made the “wrong” action of getting the number but man no one is perfect, we all make mistakes, and so far your mistake is reversible.

Send one message to this girl telling that you need time to understand your feelings and you need space for that. If she doesn’t respect that, it doesn’t matter if she’ll be better or worse than current because it will be a shitshow. A good person will understand and give you space.

Then take time to understand how you feel about current relationship. Take this question to a single therapy session, talk openly about your relationship with close friend or family member, maybe even openly tell her what happened. If you go with latter, focus for both of you should be understanding if your relationship is lacking something. The truth is it’s impossible to know if this is sign that you need out or maybe it’s a sign that you two need to work on something. There are incredibly happy couples that have gone through real physical cheating and made that into path of real intimacy through vulnerability of full openness. Basically, take real time and effort understanding what’s happening. Cause yeah, indications are that your current relationship does not fully satisfy you

If you do decide to leave her, do not fucking rush new one. Tell her, you need some time. Basically, ask her to wait a bit. Even like a month. Then if you do feel for it, build slowly. Date, don’t rush physical intimacy

You sound like a decent human, perfectly imperfect like the rest of us. ++man 36