It is not clear whether your main concern is employability or thinking well of yourself.
Unless you are seeking employment as an academic pure mathematician, you need not worry about not completing your research degree.
I used to employ hundreds of highly intelligent staff in a professional organisation. Some had PhDs, some had never tried, some had tried and found they did not want to continue with academic research. I myself thought better of pursuing pure maths research and pursued a professional career instead.
As an employer, I took very little interest in such matters. What I wanted was highly motivated and highly intelligent people who enjoyed the work I wanted done and who could bring creativity and imagination to it.
When you apply for jobs, you will undoubtedly be asked why you did not finish your research degree, but the mere fact that you did not is not negative. What would be negative would be feeble reasons for stopping.