Feeling lost

I (24M) been dating this girl (25F) for about 3 weeks. She’s kind, pretty, and socially awkward. I would say that she is definitely way more interested in me than I am in her.

At first, it seemed the spark was there. We would text and FaceTime everyday too. But then work got super busy and stressful (I work directly for a very high ranking officer at a 2 star general’s HQ) and it just seems I don’t want anything to do with her. Like everytime she texts me, I get annoyed and borderline angry.

Plus what doesn’t help is that I am still really in love with my girl best friend but she don’t feel the same way. I’ve asked her to be my gf 2x but she just doesn’t reciprocate. Like why? Our interests and life goals align perfectly but I guess beggars can’t be choosers. Already made peace I won’t be with her but if she ever changes her mind, I’d drop everything for her.

Should I break up with my girl then? Or give it more time? Don’t know what to do!