In a nutshell: LTR caught me texting on Tinder and broke up. Should I try to get her back?

The whole story: I was in a LTR of 6 months, she's 23 and I'm 24. This was my best relationship ever, I just discovered the red pill right before we started. As they were saying here, It's important to have abundance mentality. Maybe I went too far, because I was texting some girls on Tinder. Never wanted to actually fuck them or even meet, I was just enjoying some texting. But my girl considered this as cheating too. The thing is we're still talking, and I wanted to ask if It's still possible or worth it to get her back, or the trust is gone forever?